Is that for Robin? Thicke's 19-year-old girlfriend April Love Geary posts a raunchy belfie on Instagram

A belfie is the newest way of showing one's backside in a mirror selfie.

And Robin Thicke's rumoured new girlfriend April Love Geary, who is 18 years his junior, put her pert posterior on full display in a new photo posted on her Instagram account.

The 19-year-old model captured the sultry snap wearing only a navy one-piece swimsuit on Sunday.

Scroll down for video 

For Robin? Thicke's rumoured 19-year-old new girlfriend shared this raunchy selfie on her Instagram account on Sunday

April showed off her curvy assets in a plunging bathing suit that featured an open back.

The bombshell wore her long tresses lightly dampened and applied smokey black eyeshadow for an even more seductive look.

She was first linked to the 37-year-old R&B crooner on November 28 when they were spotted cruising in Robin's convertible around Los Angeles.

April Love Geary giggles at Robin Thicke romance rumours

Bombshell beauty: The 19-year-old is an up-and-coming model who is signed to IMG Models, one of the largest agencies in the world

Robin and April's romantic drive comes after TMZ posted photos of them at the USC vs. UCLA football game last week.

The couple were joined by Robin's four-year-old son Julian.

They've also been photographed together at Soho House and at Leonardo DiCaprio's 40th birthday bash.

Moving on: April was first linked to the 37-year-old R&B crooner on November 28 when they were spotted cruising in Robin's convertible around Los Angeles 

April broke her silence about her relationship with Robin.

TMZ reported that the statesque beauty chatted with the site and said, 'we're just friends.'

Robin and ex wife Paula Patton separated in February after nine years of marriage. In October, Paula filed divorce papers.

April previously posted a photo of herself lounging at Robin's estate that he owned with Paula but quickly deleted the shot off her Instagram account.

Single and ready to mingle: The 37-year-old singer and ex wife Paula Patton, who have a four-year-old son Julian together, separated in February after nine years of marriage. In October, Paula filed divorce papers.