Bella Throne sent temperatures soaring with her latest Instagram post as she flashed her underboob in a perilously small blue bikini on Monday.

The actress, 25, left little to the imagination in the racy two piece as she posed up a storm for a mirror selfie.

She turned up the heat by accessorising with a number of chunky gold bracelets and a coordinated chain necklace.

Bella hid behind a pair of large black square sunglasses and toted her belongings around in a woven beach bag by Loewe.

The beauty styled her long auburn tresses in loose waves as they cascaded down past her shoulders from under a styling woven beach hat.

In another snap, the former Disney star sat in the sand facing away from the camera while soaking up the sun at the beach.

She displayed her ‘bite me’ tattoo which is inked onto her hip and accessorised with a gold bodychain around her waist.

The Midnight sun actress, who announced her engagement to fiancé Mark Emms in May, flashed her huge 10-plus carat emerald cut diamond engagement ring in another snap to her 25.2million followers.

Bella also showed off her bold 3D red flower manicure while holding a cocktail above her head while soaking up the sun on a sun lounger in a black halter neck bikini.

She pulled her long fiery locks back leaving her fringe to frame her face and shielded from the sun behind a pair of red framed sunglasses.

Taking to her Instagram Stories, the star seemed to dress to impress in the evening donning a black crop top and a pair of low rise denim blue jeans.

Bella held up a stylish sequin blue handbag as she posed for the mirror selfie and accessorised with a chic gold necklace.

She applied a flawless palette of makeup to accentuate her beauty and styled her red tresses in loose waves.

The Time Is Up actress announced her engagement to Mark, an entrepreneur and producer, in late May.

The couple met last year on the beach in Ibiza at Cara Delevigne’s birthday party.

‘It was love at first sight as the sun rose,’ the American Horror Stories star told Vogue Weddings.

The Imagen Foundation Award winner and her fiancé also posed together in a sweet photo announcing the news on social media.

The couple had been keeping the secret for a while.

Mark, who also owns the New York City hotspot The Mulberry, actually popped the questions at Bella’s house in California on Mother’s Day.

The Divinity star told the publication she’d like to have the wedding at a country manor in the United Kingdom, but has not announced a wedding date.

The bride-to-be did reveal that she is looking for more than one look for the big day, with an eye toward vintage Schiaparelli or Dior.

‘Every bride does not need one gown,’ she said hinting at multiple wardrobe changes, ‘but four!’

The busy actress has a slate of projects on her roster, including the upcoming Saint Clare.

The horror-comedy focuses on a quiet college student with a ‘divine vocation for killing.’