Hilary Duff Shops Till She Drops

Hilary Duff does a little shopping with the paparazzi not too far behind on Robertson Boulevard in Los Angeles on Thursday.

The 20-year-old singer/actress is currently finishing up her filming of Stay Cool, alongside Mark Polish, Winona Ryder, and Josh Holloway.

Hilary plays a high school senior who flirts with an author and tries to hook up with him at the prom.

The Duffster will be celebrating her 21st birthday on September 28th!

40+ more pics inside of Hilary Duff shopping till she drops…