Britney Spears is reportedly on a big ''workout kick''.

The 'Scream & Shout' singer is said to be ''motivated'' as she pushes herself to get fit and looking ''great''.

A source to E! News: ''She's looking so great because she has been on a total fitness and workout kick recently.

''She's all about it. She's been feeling really motivated and happy and it shows.''

The 31-year-old star had a tough time earlier this year when she split from fiance Jason Trawick in January, but she seems happier than ever with new boyfriend David Lucado.

A source revealed he has genuine feelings for Britney - who shares sons Sean Preston, seven, and Jayden James, six, with her ex-husband KEVIN FEDERLINE - and isn't interested in her fame and fortune.

The insider recently said: ''[He] genuinely cares for Britney. David is very protective of Britney, and isn't dating her for fame.

''He is very, very patient with her as Britney can be prone to drastic mood swings. He has become a very calming influence in her life.''

It was also noted, however, David was made to sign a confidentiality agreement and undergo a background check before the pop star's father Jamie would set them up.

Jamie is still in control of his daughter's affairs via a conservatorship, which he obtained five years ago following her public meltdown.