Britney Spears' 'How I Met Your Mother' wardrobe to be sold for charity

Britney Spears' wardrobe from her guest role on the CBS sitcom 'How I Met Your Mother' will be sold at an online auction to benefit the Natural Resources Defense Council, an environmental organization.

The auction will begin Monday, right after the episode starring Spears airs on CBS, according to the Associated Press.

CBS and 20th Century Fox Television, which produces the show, are sponsoring the auction, which will include a navy print Juicy Couture dress, a yellow Nannette Lepore dress and a cream Nannette Lepore cardigan with blue flower details, all worn by Spears during filming.

Britney's co-stars have all praised singer's efforts on the show.

"She's friendly, shows up on time, knows all her lines, nails all of her jokes," said co-star Josh Radnor. "The only thing scandalous about all of this is how non-scandalous it is."

Fellow co-star Neil Patrick Harris admits he was skeptical when he heard the star, whose last high-profile TV spot was her disastrous showing at the 2007 MTV Video Music Awards, was signing on to their show.

"I kept saying, 'You're serious? She's going to do it? She's not going to back out?'," he admits.

But he hoped the experience may be a good grounding one for Britney.

"I don't know how often she's just hung out with other actors and normal, regular people. I hope she enjoys the system."

Jason Segel said: "Her improvs were really good.

"Sometimes at table reads you play around with lines and try different things.

"She came up with stuff that had everyone laughing.

"She's definitely a comedian."

Alyson Hannigan added: "She was so funny and she already had her character down pat.

"I had no idea she had such great comic timing."

Hannigan also felt the need to mother Britney during filming.

"I was checking on Britney all the time," she said. "And I felt very protective of her, and I wanted to make sure she was happy and comfortable."

Britney's spot on the prime-time show was booked as a one-off guest spot. But bosses have certainly not ruled out her return.

"The episode ends on a funny note - it definitely leaves it open for her to come back," Thomas said.

Britney seems open to the idea, too.

"I'm having a blast," she said. "Working at 'How I Met Your Mother' has been so terrific. Everyone has been wonderful."