Shock jock Howard Stern: Christina Aguilera is too fat to wear tight clothes

Radio shock jock Howard Stern is never afraid to stir controversy, so it's not surprising he tried to goad Maroon 5 frontman Adam Levine into a feud with his The Voice co-star Christina Aguilera.

During an interview on his Sirius satellite radio show Feb, 21, 2012, Stern asked yoga fanatic Levine why Aguilera had gained so much weight recently.

"Why do you think she's gotten so heavy?" Stern, 58, asked Levine, 32 (see video at left). "Is she upset? She used to be so f**king hot. And her clothes are too tight, right?"

An uncomfortable Adam, who's dating Victoria's Secret model Anne Vyalitsyna, declined to comment, but insisted Christina, 30, isn't plus-sized.

"Her clothes are tight," Levine noted. "She likes to wear tight clothes. She clearly likes to talk about being comfortable with being a woman and snapping her fingers and doing the whole thing."

Stern followed up by commenting that Aguilera is too big to wear tight clothes.

"When you're a plus-size woman, you can't wear the tight clothes anymore," said Howard, who speculated that the 5'2" Christina must now wear a size 12 clothing size.

Levine then quipped, "I wouldn't go that far, actually." When asked what size Aguilera is, Adam prudently replied, "I'm keeping my f**king mouth shut."