Ok, Brad Pitt, Katie Holmes AND Christina Aguilera all share a December 18th birthday? Too weird.

While Katie celebrated hers with her daughter, Xtina spent her 27th with hubby Jordan and her ever-growin' baby belly!

Jordan took his mama-to-be out to dinner at Houston's. Seriously, Houston's? I mean, I like Houston's as much as the Aguileras, but with all her hit albums, doncha think they could have afforded something a little nicer?