It's Hotpants Hilary! Wearing her favorite red pants, Hilary Duff spent some quality with son Luca in West Hollywood on Thursday.

The former Lizzie McGuire star, who announced her separation from ex-NHL star Mike Comrie in January, was spotted wearing a gray shirt, red pants and Chloe ankle boots. While some celeb moms go for a a makeup-free look while on mommy duty, she added a dramatic touch to her off-duty look with a dark lip. It seems like her newly single status is doing wonders for her!

The 26-year-old actress has been a busy bee as she has been hitting the gym hard, taking care of her almost two-year-old son and gearing up for a new sitcom. On Feb. 7th, TV Land announced that the Cinderella Story star would be jointing Sutton Foster, Debi Mazar and Miriam Shor for a new sitcom Younger, on the network that brought viewers Hot in Cleveland.

The sitcom follows 40-year-old Liza (Foster), a newly single mother who tries to get back into the working world but finds out that given her age it's almost impossible. After a chance encounter with a younger man convinces her that she looks younger than she is, Liza decided to pass herself off as 26. Aided by her best friend Maggie (Mazar), Liza lands a job as an assistant to the nightmare of a boss (Shor) but eventually finds an ally in new co-worker and fellow 20-something Kelsey (Duff) -- and gets in line to create the career of her dreams!