Demi Lovato turns 21 today, August 20th. The singer and actress got her start on Barney and Friends (we know, how cute right?!) as a young child, but rose to fame through the Disney Channel and her incredible talent for music.

Though she's still quite young, Demi has been a role model for young girls for many years. She's very open about her trials as a teen and how she was bullied by her peers, and as such has created a loyal fanbase that doesn't just love her for her music, but also for her strength and honesty.

Lately, Demi has lent her talents to the stage as a judge on "The X-Factor" and will return for next season. It's also recently been revealed that Lovato will join Glee for season 5, though her role on the show is still yet unknown. We can't wait to see!

Sartorially, Demi clearly has a passion for Topshop -- something we totally understand -- and she often wears a flirty dress from the label with a leather jacket or bold boots to match. Click through the gallery above to see her 10 best looks, and wish her a happy 21st today!