Celebrity social media pictures of the week include Bella Thorne on location shooting a film in South Africa. Bella has been using Twitter, Instagram and Vine to document her time abroad. She recently got a visit from her boyfriend Tristan Kliers, and the star shared pictures of the duo petting a tiger, playing with their food, and hanging out at the coast. It’s not all play and no work for Bella, the starlet also shared a picture on Twitter after a long day of work. Demi Lovato is busy at work on the X-Factor, and the singer posted pictures of her and her fellow judges hanging out back stage. She also shared a hilarious picture of a young Simon Cowell. Jessica Alba is hard at work on her new film but the actress has taken time between takes to share tons of on-set pictures. Showing off the 1960’s clothes, hair and cars, Jessica and cast mates posed for a series of Instagram shots.