Alexa Chung is a ''nightmare to date''.

The 31-year-old model, who is rumoured to be in a relationship with Alexander Skarsgard, has confessed she is a difficult girlfriend because she is fiercely independent and gets bored easily.

She said: ''I don't like being told what to do. And I don't want to be penned in. I don't want to feel I have to be anywhere ... I am quite restless. It makes me a nightmare to date, I think.''

The brunette beauty - who counts Arctic Monkeys' Alex Turner and Hurts frontman Theo Hutchcraft among her former love interests - also insisted she will never have Botox to retain her youthful looks as she grows older because she thinks it would be ''a bit try-hard''.

Speaking in the latest issue of Harper's Bazaar magazine, she explained: ''I saw Patti Smith the other night and she definitely hasn't had any Botox and she looks cool.

''I'm not anti, because there are people who have had it done who look really good. If I can't even be bothered to brush my hair, I don't think I should start getting face work ... I think it would look a bit try-hard.

''Being excitable and passionate is what makes you look good because if you're engaged in what's going on, you radiate youth.''