Janet Jackson is no Britney Spears. The 44-year-old singer, who is on a 35-date tour, looked totally buff on stage, with bulging biceps that rival Cameron Diaz, Madonna and Paris Hilton, who also are sporting more toned physiques.

Jackson play the Gibson Ampitheatre in Los Angeles last night (Apr. 14) to promote her Number Ones best of album with her current Up Close And Personal.

The tour kicked off in February and is worldwide. Janet looks like she spent a lot of time in the gym to make sure she was ready for the grueling trek.

Although she is 15 years older than Spears, who is 29, Jackson puts the pop queen to shame.

Spears has raised eyebrows because of her bloated look and stiff dancing in her latest video for “Til the World Ends.”

She’s about to launch her own tour in support of her Femme Fatale album.

Like Britney, Janet has struggled with weight gain and loss and was as much as 60 pounds heavier just four years ago.

“There was a time when I was so down and felt so unattractive and it lasted for a very, very long time. I used to bang my head against the wall,” she told Piers Morgan in a recent interview.

A number of celebrities have been hitting the gym hard lately to develop six-pack abs and

Check out her performance in a fan video below: