Rumors run rampant in Hollywood, and "Extra" is working overtime to set them straight. So from Jennifer Lopez to Jessica Simpson and Jennifer Aniston, here's your latest edition of Rumor Control.

Jessica Simpson just turned 25, and Wilmer Valderrama, Mandy Moore and Eva Mendes were at her party. Husband Nick Lachey even surprised his wife by tricking out her Range Rover. But are reports true that the newlyweds were keeping their distance from each other at her birthday bash?

No -- People magazine has all the party pictures in their new issue, and Senior Editor Jamie Bufalino told us, "Right after Jessica blew out the candles, she turned and gave Nick a big kiss, so they seemed like a very happy couple."

And from rumors on one star couple to another, Vince Vaughn was on "The Today Show" Wednesday morning plugging his comedy "Wedding Crashers" when Katie Couric asked him about a rumored romance with his "Break Up" co-star Jennifer Aniston. So is it true? Are Vince and Jen an item?

No -- Vince told Katie, "She's been great, and we've had a great time shooting the movie, but that's really been the extent of it. But there are worse things to be accused of."

People magazine also has new pictures of a sexy and single Jen out for dinner at the Los Angeles sushi joint Nobu with a good friend.

And finally, are Jennifer Lopez and Marc Anthony undertaking a new joint venture?

Yes -- Marc is set to star as salsa singer Hector Lavoe in a new Lopez-produced film. Jennifer is going to play his wife.