Britney Spears tweets skimpy bikini pic - New York Post

Oops, she did it again -- Britney Spears has posted another bikini photo of herself.

"Having some fun in the sun," Spears judge wrote alongside the pic. "Don't want summer to be over!"

In the shot, the slimmed down 30-year-old gives her 20 million Twitter followers a glimpse of her sunny California home that's decked out with an indoor aquarium.

Earlier, the singer posted a promo clip of her debut as a new “X Factor” judge where she told a contestant that he has a “nice soothing sound and I wish you could wake me up in the morning… singing!”

Spears is busy prepping for her new gig. Page Six revealed that the pop star was told by Simon Cowell to dress better and clean up her hair and makeup before going on the set.

Britney Spears via Twitter

Britney Spears "having some fun in the sun... don't want summer to be over! "

Sources said that after the “Oops, I Did It Again” singer turned at an early taping appearing to not be wearing a bra.

“It was made clear she is expected to be impeccably dressed and made-up for the show,” said a source. “And none of those ragged hair extensions.”

While “X Factor” reps deny Cowell ordered the singer to sack her stylist, sources tell us she’s since turned up looking amazing.