Rocking duet! Hilary Duff and her baby boy Luca dress the part for birthday party at Jack Osbourne's house

When it comes to style, Hilary Duff is no stranger to experimentation.
So when she headed to a birthday party for Jack Osbourne's daughter Pearl in Los Feliz on Saturday, the 25-year-old made sure to play up her rocker side.
With her pride and joy Luca on her hip, the two looked ready to rock.

Rocking style: Hilary Duff and son Luca wore denim and rocking T-shirts for a birthday party at Jack Osbourne's house in Los Feliz on Saturday

Hilary donned a cut-off denim vest, which she had buttoned up over a grey tank top.

Grey skinny jeans tucked into studded ankle boots.
She really played up the music theme when it came to her one-year-old son, though.
Wearing 'Rock & Roll' emblazoned in orange across his chest, little Luca was party ready.

Party time! One-year-old Luca may have been pouting, but his Rock & Roll T-shirt was the most fitting for the day's festivities

Ready to go inside! The 25-year-old singer kept it cool but her little tot looked a bit hot under the beaming sun

Pouting as he sat on his mother's hip, the blonde boy wore multi-coloured plaid shorts.

To round out the look, Hilary placed him black socks and black leather sneakers that never touched the ground.
Hilary looked refreshed after a busy week, possibly thanks to a trip to the salon on Friday.
While she was wearing a casual ensemble for the outing, Hilary chose to top it off with gothic lipstick in a deep blood red shade.

On the social circuit: The adorable duo headed into son of Ozzy Osbourne's home on Saturday for a party

Pamper session: The 25-year-old wore her blonde locks in a messy ponytail as she headed to the hair salon

Keeping in touch: Hilary remained glued to her mobile phone while carrying a dusky blue tote in her other hand

The bold lip stood out against her red tank top, and the Lizzie Maguire star also sported rolled up jeans and studded brown cowboy boots.
Hilary, 25, stayed glued to her mobile phone as she walked along, using her other hand to carry a dusky blue tote.
The mother-of-one wore her unkempt blonde tresses tied away from her face in a ponytail ahead of the pampering session.
Hilary partied at Coachella Festival last weekend but has traded it in for a weekend with the family this time around.

Goth girl: Hilary Duff vamped up an otherwise simple outfit with blood red lipstick on Friday in Beverly Hills

Trying something new: It was an unusual choice for the clean-cut former Disney star