Tom Cruise & Katie Holmes Can't Stop Pea-ing

TomKat spotted getting their party on in London. Plus, where we caught Kim Kardashian's ex, Reggie Bush, over the holiday weekend

Tom Cruise and Katie Holmes really like those Black Eyed Peas.

TomKat just hit yet another Peas concert at the 02 Arena in London. That's the fourth one they've been to since February.

And like before, the good times didn't stop at the show…

Cruise and Holmes, along with Chris Rock, were seen at the Bacardi afterparty at Indigo nightclub, where Cruise jumped on stage to introduce "Someday," the new Peas' song that's featured in his new movie with Cameron Diaz, Knight and Day. At one point, Holmes and Fergie danced together at the front of the stage. Too bad Robert Pattinson wasn't around to join Les Grossman Cruise.

Meanwhile, in other celeb sightings around the world: Dancing with Stars champ, Olympian Apolo Ohno, celebrated his 28th birthday at Tao in Las Vegas. Not only was he surprised with a poolside birthday cake, but Carrera eyewear gifted him some cool new shades.

Also at Tao, DWTS pros Cheryl Burke and Mark Ballas had belated birthday celebrations with fellow hoofers Edyta Sliwinskya and Alec Mazo.

Avatar hottie Sam Worthington was in Sin City for Memorial Day weekend at the grand opening of Encore Beach Club, while the ubiquitous Paris Hilton wore a really short minidress danced at Surrender nightclub with LMFAO. Kim Kardashian's ex, Reggie Bush, was also at Encore—two days in a row—with his sister.

About 3,000 miles away in the Hamptons, Real Housewives of New York City star Kelly Bensimon dropped by AXE Lounge, as did How to Make It In America actor Bryan Greenberg.