But when she stepped out for coffee in Thousand Oaks, California, on Wednesday, the pop star appeared to have turned the clock back in time.

Refreshed and polished, the 31-year-old looked almost as good as she did when she first hit the music scene big at age 16.

Her long blonde hair was straightened, brushed and hung neatly at her shoulders - even catching the wind as she walked across the parking lot.

The pop singer's makeup was perfectly in place, putting her smooth complexion on display.

She wore a tight dark green, short-sleeved turtleneck top that hugged her slender waist.

Faded skinny jeans tucked into high black boots that had a fold-over flap.

In her ensemble - a striking contrast to Tuesday's workout wear - exemplified that the Baby One More Time singer is in the healthiest shape she has been in years.

Her solo coffee outing was a rare one for Britney, who is nowadays regularly spotted with her new boyfriend David Lucado, whom she met after she split from fiance Jason Trawick in January.