Hilary Duff tights pilates sandals blonde Hilary Duff tights pilates sandals blonde

On Friday afternoon Hilary Duff headed to Pilates class in the valley, and the former Disney starlet was in a great mood after her workout. Hmm, might this have something to do with the fact that it's her 26th birthday today? Or maybe just because she knows how bangin' her booty looks? Either way, we love to see her smile...

The other day the Duffster stopped by the Lair Studio in Culver City with producer Billy Mann (he's made hits with everyone from Celine Dion to Ricky Martin) and the duo worked on "Better Days," which is a track on Hil's upcoming album.

We're not sure what to expect from the new EP, but last month during a Twitter Q&A she told fans, "I'm exploring a lot of cool options & don't want to give a timeline yet but I promise exciting stuff is coming.. I'm super into EDM. Definitely catchy hooks I've always cared a lot abt lyrics & love to dance!"