Britney Spears' 'Baby One More Time' Just Turned Sixteen Years Old!

Britney Spears totally rocks a pair of short shorts as she heads to her gym for a workout on Wednesday (October 1) in Los Angeles.

The 32-year-old singer was seen out in Studio City later in the day juggling two cell phones.

Britney just celebrated the 16 year anniversary for her famous hit “…Baby One More Time.”

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“Happy sweet 16 to ‘Baby One More Time’! Where did the time go!? Thx to my fans for supporting me since my 1st single #Happy16thBirthdayBOMT” Brit wrote on her Twitter account. We can’t believe it has been that long!

10+ pictures inside of Britney Spears out and about…