Joan Rivers Slams Christina Aguilera During Appearance on ‘Late Night With Jimmy Fallon’: She’s A Fatso (VIDEO)

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Joan Rivers used the “F” word on Monday night’s Late Night with Jimmy Fallon – by referring to The Voice judge Christina Aguilera as a “fatso.”

The comedy legend paid the TV visit to promote her new book, I Hate Everyone…Starting with Myself, but managed to hurl a few insults at Aguilera in the process.

“I’m at Spago’s with [my daughter] Melissa, and we’re eating dinner, and Fatso is across the way, and she comes lumbering over with that no-neck look,” Rivers joked (about three minutes into video). “And I go, ‘Here it comes.’ She comes over to my table and says, ‘You gonna finish that?'”

It’s not the first time Rivers has taken Aguilera to task over her weight.

Last year, after the singer looked zaftig at a Michael Jackson tribute concert, the E! Fashion Police host said she looked “like a pig” before adding, “She’s not just eating apples!”

Aguilera isn’t the only one to feel Rivers’ wrath during the Fallon show –she also mocked “Octomom” Nadia Suleman and Winona Ryder.

What do you think of Joan’s quips? Are they all in good fun, or did the funny lady go too far? State your case in the comments.