Britney Spears Talks Worst Career Decision, Lip Injections and Gaga Wants Collaboration?

Britney Spears says reality television was a big mistake. Opening up in a recent interview with the U.K.'s Telegraph, Spears said "X Factor USA" was not the worst, it was actually the ill-fated UPN series "Britney and Kevin: Chaotic."

"I would never do something like that again," Spears told The Telegraph of the 2005 series. "Actually, that was really bad. That was probably the worst thing I've done in my career."

Looking back at "X Factor USA," her most recent affair with reality, Spears had a better response.

"I did have trouble being overly critical at times but then I'd simply remind myself to be constructive and positive versus mean," Spears says of her time as a judge. "Being able to mentor young singers was the main plus point. I think overall it was a positive experience."

In related news, Britney Spears admits that she has had a little work done — specifically on her lips.

"I just bought the new Shiseido face wash and moisturizer. I have no problem trying new brands. A doctor I see, [Beverly Hills plastic surgeon] Dr. [Raj] Kanodia, does fun stuff to me sometimes — I've had lip injections before," Spears told InStyle in the most recent issue. "He has this peptide-based face-care product; it's green and slimy, and you mix it together and put it on your face. It does wonders. You leave it on overnight. Can you tell I love skin care?"

Fresh off the release of her new album, "Britney Jean,"' Spears is also promoting a Las Vegas residency. According to Lady Gaga, now is the time for them to collaborate.The subject of a collaboration came up during a fan chat session over the weekend. It later led Gaga to tweet Britney Spears on Twitter.

"I would do a duet with Britney Spears. I think that would be a lot of fun," Gaga told fans. "I think she's very different and interesting and intricate."

She later told Spears "@britneyspears lets do this b*tch its time."