Robin Thicke, 38, and April Love Geary, 20, go low-key in casual outfits ahead of his dapper performance on Jimmy Kimmel Live 

They've been an item for six months after the collapse of his marriage to Paula Patton.

But going from strength to strength, Robin Thicke, 38, was joined by his 20-year-old girlfriend April Love Geary ahead of an appearance on Jimmy Kimmel Live! on Monday.

Proving to be his biggest fan, April was seen walking a few paces behind Robin as they made their way into the Los Angeles studio rocking casual ensembles.

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Low-key: Robin Thicke, 38, and girlfriend April Love Geary, 20, wore casual outfits on Monday in Los Angeles

Low-key: Robin Thicke, 38, and girlfriend April Love Geary, 20, wore casual outfits on Monday in Los Angeles

Switching it up! The 38-year-old cut a dapper figure later in the day when he performed on Jimmy Kimmel Live

Switching it up! The 38-year-old cut a dapper figure later in the day when he performed on Jimmy Kimmel Live

Showing off her slender frame, April wore an ice blue racer style vest top with a pair of white jeans and snakeskin sandals as she hid her eyes behind sunglasses. 

Similar to his girlfriend Robin also wore aviator style shades as he donned a navy top with black jeans as he clutched a Louis Vuitton bowling bag.

But once on stage, Thicke was back to his dapper self in three piece black suit as he belted out some of his best loved hits.

Following his lead: April walked a few paces behind her beau as they headed inside the studio for the show

Following his lead: April walked a few paces behind her beau as they headed inside the studio for the show

Dressed down: The father-of-one wore a navy top with black jeans as he clutched a Louis Vuitton bowling bag
Dressed down: The father-of-one wore a navy top with black jeans as he clutched a Louis Vuitton bowling bag

Dressed down: The father-of-one wore a navy top with black jeans as he clutched a Louis Vuitton bowling bag

April and Robin became a couple after the singer parted ways with his wife of nine years, actress Paula Patton.

The couple began dating at the tender age of 16, after meeting at an under 21 club, and share a five-year-old son, Julian.

Paula applied for a divorce in October of last year and the pair were legally separated in March.

Doing what he does best: Robin looked great on stage in an all black three piece suit

Doing what he does best: Robin looked great on stage in an all black three piece suit

Rocking out! The chart topping singer and songwriter belted out some of his best loved hits

Rocking out! The chart topping singer and songwriter belted out some of his best loved hits

Following the finalisation of their separation, Paula revealed during an appearance on Meredith Vieira show that she finally feels like a grown up.

Patton said: 'I live in a place of gratitude and growing up in many ways I think, I moved from my parents' house to moving in with Robin and now I'm like becoming an adult at this old age.'

She added: 'I'm really like a real woman now. It's been a long year and a lot of challenges but I've grown quite a bit and just getting used to change.' 

Throwing up the peace sign: Thicke's marriage to his ex-wife Paula Patton broke down in October 2014 after one of his most successful years in the music industry

Throwing up the peace sign: Thicke's marriage to his ex-wife Paula Patton broke down in October 2014 after one of his most successful years in the music industry

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