Christina Aguilera Tells Jimmy Kimmel She’s Not Sure If She Wants to Make a Cameo in Britney Spears’ Memoir: ‘Dude, I Don’t Know’

Britney SpearsandChristina Aguilerahave been in the public eye for nearly their entire lives. The formerMickey Mouse Clubstars began their careers alongside each other in the early 1990s and then both blew up the charts later in the decade during a period when the press constantly tried to pit them against each other in a manufactured battle of thepopdivas.

So when Aguilera slipped onto the couch for a chat onJimmy Kimmel Live!on Monday night (Oct. 16), naturally the host wondered if XTina hopes to make a cameo in Spears’ eagerly anticipated tell-all memoir,The Woman in Me.“Do you think you will be in it?” Kimmel wondered. “Has she called you and said, ‘hey, heads up?’”

“Dude, I don’t know,” Aguilera smiled when Kimmel wondered if there might be a chapter on Spears’ chart rival, who, you might recall, like, Britney, alsoshared a kiss with Madonnaat the 2003 MTV VMAs. “Are you hoping that you’re in it?” Kimmel asked.

“I don’t know! I don’t know!” Aguilera said. “Am I hoping? I mean, I’m hoping that, you know, everything is all good with her and everything’s beautiful. I think the future should be celebrated.”

OK, fine, Kimmel said, but if she had to choose between being in the book — which comes out on Oct. 24 — and not being in the book, what would Aguilera prefer? “Um…you know… for real?” she stammered as Kimmel said he would definitely like to be mentioned in the book that covers Spears’ difficult 13-year conservatorship, her famous head-shaving incident and Britney’s difficult relationship with her estranged father, Jamie Spears.

“Maybe you will be in it. Let’s put it this way,” Aguilera said. “I’d rather be it you than me. So hopefully you’ll be in it. You’ll make the book.”

Aguilera also described her family’s way over-the-top Halloween decorations — including a haunted house with different levels of fright and previewed her upcoming intimate Las Vegas show at the Voltaire Belle de Nuit at the Venetian Resort Las Vegas that kicks off on New Year’s Eve weekend.