Celebrity birthdays in July

17 of 53: Mitchel Musso turns 21 on July 9, 2012. The actor is known for movies such as 'Secondhand Lions,' 'Monster House' and the show 'Hannah Montana.'

(Pictured: Mitchel Musso appears on Walmart Soundcheck on April 20, 2011.) ( Photo / flickr.com/photos/lunchboxstudios/)