Christina Aguilera blonde kissing lipstick beverly mozza singer dress Christina Aguilera blonde kissing lipstick beverly mozza singer dress

Christina Aguilera took her sexy beau Matt Rutler to dinner at Osteria Mozza in Beverly Hills ... and it appears Matt was Xtina's dessert.

The songstress, rocking her bright red lipstick, was all smiles as she left the 90210 eatery. Funny thing is ... Mr. Rutler seemed to have more lipstick on than his ladylove. Lucky guy!

See more of Aguilera's red lip debacle ... after the jump.