As well as visiting Good Morning America in a pretty pink outfit, the former Lizzie McGuire star was seen at the AOL Build Speaker Series.
For her second engagement of the day, she switched into a smart black dress and heels, ahead of joining her co-stars to chat about Younger in front of a live audience.
Hilary – who dyed her hair green earlier this month after being inspired by the colour of the ocean – stars alongside Debi Mazar and Sutton Foster in the new comedy from Sex and the City creator Darren Star.
Starting tonight on TV Land in the US, the series is about a newly-single 40-something woman called Liza (Sutton) who finds after giving up her career to raise her daughter can't get back in the job market.
So, she undergoes a makeover in order to make her look younger and grab her the publishing job she wants.
Pretending to be 26, Liza ends up with a plum job at a publishing house where she befriends an actual 20-something, Kelsey, played by Hilary Duff.