Britney Spears blasted pop rival Christina ‘Xtina’ Aguilera for deciding to team up with her ex-boyfriend Justin Timberlake for The Justified & Stripped Tour in 2003 – a year after the couple’s bitter split.

The talented trio had originally met as children starring as Mouseketeers on The Disney Channel’s The Mickey Mouse Club from 1993-1994 where Britney and Christina shared a dressing room.

And despite Spears and Timberlake ending their three-year romance, Aguilera told Rolling Stone in 2003 she had ‘a feeling that there’s going to be some reconciliation. I know that they talk and everything, and it’s cool. I don’t think it’s over.’

‘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,’ the 41-year-old Grammy winner wrote in her memoir The Woman In Me.

‘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.’

Britney continued: ‘Even if they weren’t trying to be cruel, it felt like they were just pouring salt in the wound. Why was it so easy for everyone to forget that I was a human being — vulnerable enough that these headlines could leave a bruise?’

Spears also admitted she was jealous of the 42-year-old R&B belter for having the freedom to party with some of their shared back-up dancers during her 13-year conservatorship, which restricted alcohol consumption.

‘[Christina] seemed pretty messed up,’ the Mississippi-born mother-of-two wrote.

‘It would have been nice to have drinks with them, to get rebellious, sassy, fun.’

But it wasn’t all negative as Britney praised Aguilera and Gwen Stefani – who both appeared on The Voice in 2016 – for coming off ‘really professional on TV’ and wrote: ‘When the camera is on them, they thrive.’

Curiously, Spears completely omitted the five-time Grammy winner from the chapter of her 288-page tell-all where she discussed her open-mouth kiss with Madonna at the 2003 MTV Video Music Awards despite her also locking lips with the Queen of Pop.

At the time, Christina told Blender the semi-retired pop star ‘seemed nervous the whole time’ backstage like ‘a lost little girl, someone who needs guidance.’

After Britney heard Aguilera’s comments she scoffed to the same outlet in 2004: ‘When someone has been rude to you so many times, it’s like, “You know what, Christina, I’m really not about the fake anymore.”‘

Copy link to paste in your message

And despite Spears and Timberlake (pictured in 2001) ending their three-year romance, Aguilera told Rolling Stone in 2003 she had ‘a feeling that there’s going to be some reconciliation. I know that they talk and everything, and it’s cool. I don’t think it’s over’

Copy link to paste in your message

Spears continued: ‘Even if they weren’t trying to be cruel, it felt like they were just pouring salt in the wound. Why was it so easy for everyone to forget that I was a human being — vulnerable enough that these headlines could leave a bruise?’

Copy link to paste in your message

She’s so lucky: The Mississippi-born mother-of-two also admitted she was jealous of the 42-year-old R&B belter for having the freedom to party with some of their shared back-up dancers during her 13-year conservatorship, which restricted alcohol consumption (pictured in 2000)

So perhaps that’s why the Staten Island-born, half-Ecuadorian singer stammered as Jimmy Kimmel asked her last week if she wanted to be included in The Woman In Me: ‘I’d rather be it you than me.’

Christina added: ‘I’m hoping that, you know, everything is all good with her and everything’s beautiful. So, you know, I think the future should be celebrated.’

Simon & Schuster paid Spears $15M to pen her highly-anticipated memoir – hitting shelves this Tuesday – which has already topped Amazon’s Best Seller’s list.