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It’s usually Jennifer Lopez and Marc Anthony who do the singing, but Gossip Cop has learned that President Obama led a group of senators and congressmen yesterday in a rendition of “Happy Birthday” for Anthony, who turned 41.

On Wednesday, the couple began a whirlwind visit to Washington, DC, where they were first given a private tour of the White House, along with their 19-month-old children Emme and Max. Gossip Cop is told that while his parents spoke with Obama in the Oval Office, little Max amused himself by running wild around the White House.

Next stop for Lopez and Anthony was Capitol Hill, where they met with Speaker of the House Nancy Pelosi and discussed education and the new Marc Anthony Scholarship Fund, which his rep told Gossip Cop was set up to “fund Latino students who want to pursue higher education.”

The celebrity couple met up again later in the evening with Obama at the Congressional Hispanic Caucus Institute’s annual awards gala, where backstage before the president spoke, Obama led senators and members of congress in singing “Happy Birthday” to Anthony, who was honored at the event with a Lifetime Achievement Award. Lopez and Anthony were seated at the awards ceremony with Supreme Court Justice Sonia Sotomayor, whom you may recall Gossip Cop exclusively reported was the guest of honor at a private dinner party the celebrity couple threw at their Long Island, New York home on August 17.

But the day didn’t end quite yet for the couple, who had already met with members of the Executive, Legislative and Judicial branches. After Anthony received his honor, Lopez had a small birthday celebration for her husband on the roof of the W Hotel.

Anthony’s rep told Gossip Cop, “Marc said he couldn’t have had a more perfect birthday.”

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It was a great week for Gossip Cop.

We were the first to confirm that Celine Dion was pregnant with her second child at the age of 41.

We then broke the world exclusive of Jennifer Lopez and Marc Anthony hosting an intimate dinner for Supreme Court Justice Sonia Sotomayor at their New York home.

Next we were also the first to dispel the rumor that Paris Hilton and Doug Reinhardt were engaged after talking with Paris’ mom.

And that scoop was followed up with our exposing how the Mirror did not have an interview with Robert Pattinson, as the paper had claimed. Pattinson’s rep even gave Gossip Cop an exclusive comment about it.

On the subject of Pattinson, the “Twilight” star was the focus of a few stories. First, we had footage showing how the paparazzi staked out Pattinson and Kristen Stewart with long lenses when they returned to their Vancouver hotel after going to a Kings of Leon concert. There was also a false report that the two were moving in together. And there was a ridiculous rumor that Stewart fought with Pattinson because she thought Megan Fox was making the moves on him.

Perez Hilton kept us busy this week (as he always does). He reported that Michael Jackson had been buried. Of course, the King of Pop has yet to be buried. Oops. He also had Ashlee Simpson and Pete Wentz on the “brink of divorce” – again wrong. He even rehashed the incorrect rumor that Jennifer Aniston and Gerard Butler are hiding a secret on-set romance. And Perez’s fertile imagination took over when he speculated wrongly that Anna Paquin is pregnant, which she is not.

Also this week: Numerous outlets reported that Zac Efron and Vanessa Hudgens were engaged until Gossip Cop corrected it. And in more Hudgens news, we set the record straight that she is NOT joining the cast of “Twilight.”

In “Idol” gossip, the New York Post claimed that Jessica Simpson was trying to take Paula Abdul’s spot – wrong — but we did report that Joe Jonas was tapped to be a guest judge.

Some stories from the sets of movies included a mysterious item that Brad Pitt was going to do some additional scenes for the “Sherlock Holmes” movie, which has already finished filming, because the studio thought the film was lacking. The only thing lacking were facts – Pitt is not doing “Sherlock Holmes.” In a related note, it was reported that “Sherlock Holmes” star Robert Downey, Jr. was going to take over the role of Lestat in the next “Interview With The Vampire” movie. We took a bite out of that rumor, too.  And there were tales of tension between Gwyneth Paltrow and Scarlett Johansson on the set of “Iron Man 2,” but Gossip Cop investigated, and found there was no truth to it.

Speaking of Johansson, there was also a story that Alanis Morissette was writing a tell-all memoir. In it allegedly is a chapter about her times with ex-boyfriend Ryan Reynolds, which the National Enquirer claimed was going to upset his wife Johansson. There is no such chapter, and instead the book will feature Morissette’s photos from the road and some recipes.

It was also a week for wildly crazy rumors. Among them was the story about Eminem dying in a car crash while talking on his cell phone.  And then there was that off key story about Mel Gibson doing a duet on his girlfriend’s new album.  Equally wrong were articles about Cameron Diaz dating Keanu Reeves and Hugh Grant asking a first-time director for a role – and getting turned down.

Like any good rumor cop, we showed you a fun video of Ashton Kutcher colliding with a paparazzo, and a couple of Hollywood stars gave Gossip Cop props this week! And after we ran into Lindsay Lohan she gave us a shout-out on Twitter. And Kristen Bell was nice enough to Tweet about Gossip Cop after we corrected an alarmingly wrong Star magazine story about her being awoken by her neighbors who heard her smoke detector after she allegedly fell asleep while cooking eggs. Total eggs-ageration!

Gossip Cop is looking forward to another week of busting bad dish!

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Yesterday, GossipCop.com exclusively broke the news that Jennifer Lopez and Marc Anthony hosted a private dinner on Monday night at their Long Island, New York home for Supreme Court Justice Sonia Sotomayor, the first Hispanic to sit on the high court.

Today, a rep confirmed to Gossip Cop that at the dinner for Sotomayor were 18 friends, family members, political figures, and even another celebrity. We’re told among those at the intimate dinner (and earlier cocktail party) were Lopez’s sister, Lynda, New York Congresswoman Nydia Velazquez, who chairs the Congressional Hispanic Caucus, and close friend Ricky Martin.

The cocktail party and dinner extended from the early evening until around midnight.

Both Lopez and Justice Sotomayor were brought up in the Bronx.

The rep told Gossip Cop exclusively, “Marc and Jennifer were honored to be able to host this dinner for [Sotomayor].”

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Gossip Cop is reporting exclusively that Jennifer Lopez and Marc Anthony hosted a dinner in honor of Sonia Sotomayor, the first Latina Supreme Court Justice. The intimate get-together was last night at the couple’s Long Island, New York home.

Gossip Cop is told the dinner was preceded by a cocktail party and attended by about a dozen people, mostly political types.

Everyone in the Lopez and Anthony camps are remaining mum about the private dinner party.