Keeping Up With Caitlyn! Caitlyn Jenner Returns

Who ya gonna call to inject a little life into Keeping Up With the Kardashians?

Caitlyn Jenner, of course! A source tells OK! that E! network executives have asked Cait to film a few appearances on the increasingly ratings-challenged reality show — and that Kris Jenner, a KUWTK executive producer and Cait's ex, hates every minute of it.

"E! is insisting that Caitlyn come back because she adds a lot of drama," says the insider.

Cait makes no effort to get along with Kris, the source says, "and every time they're in a room together, Kris tenses up and reaches for the wine.

She is still in a lot of pain. The way Cait handled their split was petty and ugly, and she took half of Kris's money, which still stings." While Cait's relationships with Khloe, Kourtney and Kim are also rocky — "Khloe is outright rude to her," says the insider — she remains close to Kendall and Kylie, and she's already filmed some scenes with them.

"The situation is making Kris sick," the insider says, "but she knows she has no choice."