But the first order of the day for TomKat & Friends was a trip to Cruise's daughter Isabella's soccer game, where Cruise's sister Cass, mom Mary and Holmes' parents - all in town for the party - laughed and kicked the ball around at halftime (Mary even showed off some fancy footwork).
In the evening, it was off to Wagner's home, although Holmes's family stopped for appetizers at the Beverly Hills Hotel's Polo Lounge on their way.
At the party, they joined guests including Jennifer Lopez, Marc Anthony, Brooke Shields, Will Smith and Jada Pinkett Smith - all of whom made it to the couple's Italian wedding - along with Steven Spielberg, Jerry Bruckheimer, Orlando Bloom, Dakota Fanning and Cruise's pre-Holmes girlfriend, Penelope Cruz.
Said one guest, "Tom seemed really proud, parading Katie around his guests."
Any tension with his ex? No way!
"There was so much love in the air that it seemed like a family reunion."
No word on whether there were any three-minute kisses or other bizarre antics.
Just a lot of fun! Fanning, Cruise's co-star in last year's Spielberg-directed War of the Worlds, told People Sunday at the premiere of her movie Charlotte's Web: