Britney Spears made a showstopping red-carpet appearance at the Smurfs 2 premiere in LA on July 28, but just weeks later, the popstar has reverted back to her old ways. Heading to a dance studio in Calabasas, California on Friday, the 31-year-old looked far took casual Friday to a whole new level in grubby tracksuit pants.

Although we have some better examples for age factor but Britney Spears can be quoted as well. She almost turning 31 and is mother of two kids Sean Preston and Jayden James but shows no sign of having given birth to two children or of aging. Here when she stripped down to a white bikini in we held our breath.

Britney Spears was snapped showing off her amazingly flat stomach at a family party in Brentwood, California on Saturday. It was thought she, her dad, her brother and her sister Jamie Lynn were celebrating the Mexican festival Cinco de Mayo (Spanish for "fifth of May"), an annual celebration of Mexican heritage and pride.

Come on, Britney. I can't be posting that I think you're starting to look sexy again one week and posting that I think you look like a hot mess the next but you're not really leaving me much of a choice here. These performance pictures from Estadio Unico, Buenos Aires are just... no.

Have I gone back in time? Nope – just Britney Spears flashing her crotch again. At least she’s wearing panties this time, I guess – cute ones too. Being that these pictures were snapped in London, I’m really tempted to do a London/France/Underpants joke but I won’t. Instead, I’ll confess something I never thought I’d say.

She has been everywhere so we cant say she picked these colors to make a news. She is hit anyway. But there is something surely more than routine, she’s laughing, smiling and having a blast with her new boyfriend and her banging  bikini body and who wouldn't be if they were in her position?