She might want to call Rosie Huntington-Whiteley for some athletic gear fashion tips!

Britney Spears headed to the 24 Hour Fitness in Calabasas this morning to squeeze in a workout, and the pop princess didn't exactly look ready to hit the gym...

If she wasn't wearing running shoes we would think she was ready for bed in this outfit!

Although the "Toxic" singer and new beau David Lucado have been attached at the hip since they began dating, her boy toy opted to sit out on the sweat session apparently!

Maybe new love has healed old wounds from past relationships, as reports claim the former X-Factor judge is ready to finally put all her past drama with ex-husband Kevin Federline behind her for the sake of their boys.

"It's taken a while but Britney says she and Kevin have finally moved on. They're never going to be best pals, but they're at a stage where they can enjoy each other's company. Britney feels guilty for what she put the boys through, so she's doing what she can to give them a stable life," a source dished to Closer magazine.

Brit Brit has come such a long way since her head shaving days!