Fresh from his do-gooding mission in New Orleans, Brad Pitt and Angelina Jolie joined Gwen Stefani and Gavin Rossdale at the WBC Welterweight title fight match as American Floyd Mayweather knocked Brit Ricky Hatton out in the 10th round Saturday. The cozy couples were later spotted getting into the same limo afterwards. No doubt the pairs swapped parenting tips. After all, Stefani delivered her son Kingston in May 2006 the day before Jolie gave birth to daughter Shiloh. The couples have also shared a playdate. Pitt has been a longtime pal of Stefani: He and Jennifer Aniston attended Stefani and Rossdale's 2003 L.A. wedding ceremony.