What is 'I think you're lovely' in French?

Tu fais belle is a French equivalent of 'You look so beautiful'. The subject pronoun 'tu' means 'you'. The verb 'fais' means '[you] are doing or making, do or make, to do or make'. The feminine adjective 'belle' means 'beautiful'. All together, it's pronounced 'two feh behl'.

That's for a 'beautiful' female. For a 'beautiful' or 'handsome' male, it becomes 'beau'. So the phrase is pronounced 'tyoo feh boh'.