AceShowbiz - Britney Spears has raged at her pop rival Christina Aguilera for deciding to team up with her ex-boyfriend Justin Timberlake for a tour, a year after the couple's bitter split. The "Toxic" singer, 41, dated the NSYNC member, Justin, 42, from 1999 and 2002 and in 2003 later he and Christina, 42, hit the road for "The Justified and Stripped Tour" and posed for a raunchy Rolling Stone cover.

Britney says in her memoir "The Woman in Me", "They were together on the cover of Rolling Stone, him in a black tank top, looking at her with sexy eyes, her looking out at the camera, wearing a lace-up black shirt."

"In that story, she said she thought Justin and I should get back together, which was just confusing, given how negative she'd been elsewhere," she shares of her reaction. "Even if they weren't trying to be cruel, it felt like they were just pouring salt in the wound." She wonders, "Why was it so easy for everyone to forget that I was a human being - vulnerable enough that these headlines could leave a bruise?"

Britney, Justin and Christina met while the trio starred as children on The Disney Channel's "Mickey Mouse Club" from 1993 to 1994, with the two girls sharing a dressing room.

Christina told Rolling Stone in 2003 that despite Britney and Justin ending their relationship a year earlier she had a "feeling that there's going to be some reconciliation." She added, "I know that they talk and everything, and it's cool. I don't think it's over."

Britney also admits in her book she was jealous of Christina's freedom to party while she was locked into her 13-year conservatorship, which restricted partying. The mum-of-two adds in her autobiography, "(Christina) seemed pretty messed up. It would have been nice to have drinks with them, to get rebellious, sassy, fun."