Leona Lewis' boyfriend is ''adventurous''.

The 29-year-old singer admits she's constantly surprised by her spontaneous partner German dancer Dennis Jauch, and has credited him with helping her become more daring, too.

She gushed: ''He'll be like, 'Come on, babe!' and I'll be like, 'No, I'm so embarrassed!' That's what I love about him. He's so adventurous. I'm good to just sit there and go with the flow and he really brings me out of my shell. He's very romantic and very sweet, too.''

The 'Bleeding Love' hitmaker also feels it's important to keep your partner on their toes and not let the romance fizzle away.

Leona explained: ''Sometimes you can become complacent in relationships. I read about how it's important to treat your partner like you don't have them yet, like when you're first getting together.''

While Leona and Dennis have been happily dating for four years, she insists they have no plans to tie the knot just yet.

She told OK! magazine: ''I haven't thought about [marriage] too much. I'm not in that headspace yet, but I know I wouldn't want anything crazy and big for my wedding.''