The star delivers her sixth show Sunday, acting confident and singing provocatively

It’s now six shows under her belt for the rejuvenated Britney Spears, who played to an appreciative, sold-out crowd at Miami’s Mansion Sunday night.

After many fans had stood in line since late afternoon, Spears took to the stage to entertain them at 10:35 p.m., accompanied by four blonde dancers, all of whom could have won Paris Hilton look-alike contests.

The star attraction, showing off her midriff, wore a micro mini that bared her black panties from the rear and, on top, a bright pink bra covered by another, bejeweled bra.

The crowd ate it up, screaming, “Britney! Britney!”

“What’s up, Miami!?” Spears, 25, shouted back at them. Prolonged screams from the crowd prompted the smiling star to sing “Baby One More Time.”

Whipping her blonde extensions in every direction while on stage, Spears was so into her dance moves that her bejeweled bra came undone and revealed the pink one underneath.

Looking flustered, Spears held her beaded bra with one hand and tried to keep singing, only to run off the stage eventually – flashing a smile as she made the hasty retreat – and let her backup dancers finish the song.

After about a three minutes, Spears returned, and a fellow from the audience was brought on stage and seated in a chair – as Spears danced provocatively for him. Her outfit: the pink bra, a black, lace-up bustier, black hot pants with fuchsia jewels on them, and nude fishnets with white go-go boots.

She left the stage for another wardrobe change, this time coming back in a denim miniskirt, the fuchsia bra and a white long-sleeve fur coat cut off at her abs – all to sing “Do Something,” delivered with confidence.

As she did at her House of Blues Orlando concert on Saturday, Spears performed “Toxic” for her finale.

“Miami, you guys rock, I love you so much!” Spears shouted and then walked offstage.

Among the guests at the concert were Madonna’s brother, Chris Ciccone, and Tracy Young, the deejay who spun at Spears’ 21st birthday as well as at Madonna’s December 2000 wedding to Guy Ritchie in Scotland.

“Whether she lip-synchs or not, there was a line around the block,” said Young of Britney’s show. “I’m looking forward to her comeback, I think she’s going to be fierce.”