Cara Delevingne is reportedly ''obsessed'' with singer Heloise Letissier.

The 'Paper Towns' star was devastated when she split from St. Vincent, aka Annie Clarke, in August, but has now turned her attentions to the bisexual French beauty, who performs under the pseudonym Christine And The Queens.

A source told Grazia magazine: ''Cara was heartbroken when Annie ended their relationship but she's made no secret of her crush on Heloise.

''She really admires her artistry and thinks she's super-sexy, so I wouldn't be surprised if that ended up developing into something.''

It was recently claimed Cara and St. Vincent - who is now believed to be dating Kristen Stewart - ended their 18-month romance because their work kept them apart for long periods of time.

A source previously said: ''Cara and Annie still care about each other, but pressures of the long-distance romance just became too much.

''The cracks were beginning to show on Cara's birthday in August when Annie wasn't there for her party.

''They decided to call it a day but remain pals and are hoping they can work things out as it's no doubt they really love each other.''

Despite the singer's new romance, she is said to still have feelings for the singer-and-actress.

A source said: ''Annie is totally in love with Kristen but she still has feelings for Cara. It ended dramatically and neither of them really wanted to break up, but neither of them could seem to make it work with their hectic schedules.''