Christina Aguilera matthew rutler karate hillstone santa monica

Christina Aguilera and beau Matt Rutler took her son Max to karate class on Saturday, and while the pop diva wasn't all that thrilled, her little boy couldn't contain his excitement. What a cutie!

While Xtina wasn't in the best mood today, Ellen DeGeneres made her crack a smile the other day when she asked about her co-stars on The Voice ... specifically Cee Lo Green's apparent problem with flatulence. The singer, who turns 32 on December 18, told Ellen, "[I'm sitting] between Blake and Cee Lo with his gas over there ... That's why I have the fan, you know." Xtina quickly added, "I love you Cee Lo. Don't be mad. Everybody knows."

Oh, like she never toots? Come on...