Rosie Huntington-Whiteley looked incredible wearing a sexy swimsuit on Instagram on Wednesday. 

The supermodel, 37, slipped into the black one-piece which had a V-shaped cut-out at the cleavage and a white trim at the top and on the straps. 

She reclined on a low lounger while posing in a spa, showing off her lithe legs in the process nad running her fingers through her long honey blonde hair. 

Sitting up in some of the images, she also lay down for a moment as she gazed out into the distance wearing the £185 ensemble from Monday Swimwear. 

The Clovelly swimsuit from the label comes in eight different colourways and Rosie opted for the black/ivory version.

Rosie Huntington-Whiteley showed off her lithe legs in a stunning £185 swimsuit as she posed up a storm while lying on a lounger at a spa on Instagram on Wednesday 

The Clovelly swimsuit by Monday Swimwear comes in eight different colourways and Rosie opted for the black/ivory version

She wrote in the comments: 'Obsessed with this one piece #AD.'

The posts come just days after Rosie celebrated her birthday last week and on Friday, she shared some glam pictures of herself wearing a pink dress. 

She was snapped blowing a candle on top of a stunning three-layer cake made by @thepinkcooker as she was surrounded by her loved ones. 

'But he wanna lick the icing off… #37,' she captioned her sizzling carousel.

The catwalk favourite rocked a set of glamorous gold jewellery from Tiffany&Co, including cuff bracelets and high tide earrings.

Rosie was spotted looking all partied out her boozy birthday celebrations in London that evening.

The model was spotted leaving Lou Lou's private members club with pals, followed by a trip to the Chiltern Firehouse.

Rosie showed off her incredible figure in her sheer pink midi dress, which had a drink stain on it, with a leotard underneath. 

She boosted her height in lace-up heels and carried her belongings in a small white shoulder bag.

Rosie stayed at the venue until 4am, when she was escorted to her car by her driver.

She wrote in the comments: 'Obsessed with this one piece #AD.'

She shared image of herself relaxing in lots of different positions while enjoying some downtime

She ran her fingers though her hair as she reclined once more 

Rosie's honey blonde hair cascaded down past her shoulders 

She walked tall as she showed off her stunning silhouette from the water's edge 

Rosie celebrated her 37th birthday last Friday, before partying the night away at her pal Victoria Beckham's 50th bash the night after

The Victoria's Secret alum looked ethereal in a skin-tight baby pink midi dress with turtleneck and long-sleeves as she blew candles from a cake made by @thepinkcooker