Britney Spears is ''in love'' with her new boyfriend David Lucado.

The 31-year-old singer, who split from ex-fiancé Jason Trawick in January, has fallen head over heels for her new beau - whom she began seeing in March - gushing that she has developed strong feelings for the ''passionate'' legal researcher.

She candidly told 'Entertainment Tonight': ''I'm in love. I like the fact that he's very stubborn and he's stuck in his ways. He's just a simple man. I adore him. He's really funny and he's really passionate. I love the fact that anything he's involved in he's passionate about, and it's contagious.''

The 'Work Bitch' hitmaker also revealed that her father Jamie Spears even did a background check on Southern gentleman David to ensure he is good enough to date the star.

She added: ''That is true. My dad's a little crazy like that.''

Britney, who has sons Sean Preston, eight, and Jayden James, seven, with ex-husband Kevin Federline, 35, admitted she isn't sure she wants to marry again but would love to have another child.

The songstress also paid compliment to former boyfriend, Justin Timberlake, 32, declaring her love for his recent collaboration with Jay Z, 'Holy Grail'.

She enthused: ''I really like Justin Timberlake's 'Holy Grail'. I like that song. I think it's, like, mystical.''