Justin Bieber spent the weekend in Amsterdam after a rough week in London.After a disastrous week in London where the 19-year-old singer was almost two hours later for his concert, was rushed to hospital for shortness of breath and had an angry altercation with a photographer, Justin and his entourage enjoyed a weekend off in Holland, where he visited a fast food outlet with friends.Chipsy King marketing manager Amir Beaucaire told E! News: "I got a call from my dad, his employee called him saying Justin Bieber was in our shop and had fries. He was with a couple of security guys.""People love our fries, but Justin is definitely the most famous person we have ever had to come to our store."Justin has blamed his actions in London on a "rough week", writing on his Twitter: "Ahhhhh! Rough morning. Trying to feel better for this show tonight but let the paps get the best of me."Sometimes when people r shoving cameras in your face all day and yelling the worst thing possible at u...well I'm human. Rough week"Not gonna let them get the best of me again. Gonna get focused on this show tonight. Adrenaline is high now. Gonna put it on the stage"Only way someone can break u is if u let them. (sic)".