Britney Spears admitted she feels ‘vulnerable and exposed’ as her ‘body looks bigger’ in a new Instagram post on Monday.

The pop star, 43, slipped into busty sheer black lingerie for the racy video, layered over a red thong, as she struck a number of poses for the camera.

In the caption, she wrote: ‘I will probably take this down tomorrow … It’s weird wearing lingerie … The intention is supposed to be Sєxy!!! S***, the pressure.’

‘But it’s weird, I feel way too vulnerable and exposed, and my body looks bigger so I guess I’m not a stick thin model … I would be a, let’s just say, voluptuous model.’

She danced around to the song Closer by Kings Of Leon, wearing her blonde tresses in a wavy style and a smoky palette of makeup.

It comes just after she showed off her abs in a red H๏τ outfit in another Instagram post after rekindling her romance with Paul Soliz. 

Britney Spears admitted she feels ‘vulnerable and exposed’ as her ‘body looks bigger’ in a new Instagram post on Monday

The pop star, 43, slipped into busty sheer black lingerie for the racy video, layered over a red thong, as she struck a number of poses for the camera

On late Sunday evening, the hitmaker took to social media to share a video of herself to show off her toned physique.

She flashed her abs in a bright red dress with a plunging neckline, long sleeves and a cutout revealing her stomach.

In the clip, the Princess of Pop – who Celebrity Net Worth says has a net worth of $40M – chewed gum, flashed a smile and showed off her monochromatic ensemble as she danced and grooved in front of a cozy fireplace.

This comes after it was confirmed she got back together with her felon ex, seven months after they broke up, when they were spotted spending Valentine’s Day together.

The video was accompanied by U2’s song With or Without You.

In her latest post, she opted out of writing a caption and simply included two doves and a sword emoji in the middle.

At one point, the Toxic singer waved around her finger while dancing and flipping her hair.

She was filming herself in front of a fireplace, and there was also a lit candle on the ground nearby, just like in a previous post where she revealed she ‘burned down her bathroom.’

In the caption, she wrote: ‘I will probably take this down tomorrow … It’s weird wearing lingerie … The intention is supposed to be Sєxy!!! S***, the pressure’

She added: ‘But it’s weird, I feel way too vulnerable and exposed, and my body looks bigger so I guess I’m not a stick thin model … I would be a, let’s just say, voluptuous model’

She danced around to the song Closer by Kings Of Leon, wearing her blonde tresses in a wavy style and a smoky palette of makeup

Britney seemed to be in high spirits as she filmed her latest video

Her latest post comes amid concerns for the star as she recently rekindled her relationship with ex-convict Soliz.

Read MoreEXCLUSIVE New fears for fragile Britney: Terrifying testimony of family member about felon boyfriend

On Valentine’s Day last month, she was spotted spending time with her former handyman and his children, confirming they were back on.

And late last month, a source told DailyMail.com that Spears was hesitant to get back together with her felon ex for one reason, and it wasn’t because of his past criminal record or previous claims that he was ‘using her for clout.’

According to an insider, Spears was torn due to accusations that he is a ‘ᴅᴇᴀᴅbeat dad.’

The source claimed that she loves Soliz, who has a criminal record that includes charges of disturbing the peace and felony firearm possession, ‘makes her the center of his world’ after feeling like her ex-husband Sam Asghari was ‘never present.’

‘Britney felt like Sam ignored her and was never present,’ the insider told DailyMail.com.

‘He was always playing video games and she felt he never really wanted to spend time with her unless it was for a social media post, or if he needed some help getting an audition.’

‘Paul makes Britney the center of his world.’ Last year, DailyMail.com exclusively spoke to the mother of five of his nine children last year, who accused him of being a ‘ᴅᴇᴀᴅbeat dad’ and failing to pay child support.

‘Britney had to fight so hard to get her boys back in her life, so this was the one thing that really made her question him,’ the insider dished.

It comes just after she showed off her abs in a red H๏τ outfit in another Instagram post after rekindling her romance with Paul Soliz 

She flashed her abs in a bright red dress with a plunging neckline, long sleeves and a cutout revealing her stomach

The singer reunited with her formerly estranged sons Sean Preston, 19, and Jayden Federline, 18, who she shares with her ex-husband Kevin Federline, last year after their relationship became fractured.

The source claimed Spears has ‘worked hard’ to make sure that Soliz is now a ‘present father to his kids’ and that she has happily ‘taken on the role of stepmom.’

However, Spears’ friends are ‘concerned’ that the ex-convict will ‘suck her dry and leave her like men have in the past.’

But the insider said the singer doesn’t care for their support about her romance as he ‘makes her happy’ despite the ‘several blowout fights’ they have had.

‘It is like she is constantly having to defend her reasoning for wanting to be with this man.’