Carrie Underwood took to Instagram to show off her bikini body on Sunday.

The 40-year-old Before He Cheats songstress threw a peace sign as she lounged on an outdoor sun-bed in the shade.

Over the weekend, she decided to take a break and relax under the warm sunshine while captioning the post, 'Finally... sunshine! Haven't seen the sun in 6 days... feels good!' 

The mother-of-two looked fit in a green $305 'Maldives Adjustable' bikini featuring gold hardware by Heidi Klein.

The beauty wore her blonde tresses behind her ears and appeared makeup free behind Ray-Ban mirrored sunglasses.

Looking good: Carrie Underwood looked fit as she showed off her bikini body in a $305 'Maldives Adjustable' bikini featuring gold hardware by Heidi Klein on Sunday

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Carrie Underwood looked beach ready wearing a bikini by Heidi Klein, in a snap she posted to Instagram.

The 'Maldives' bikini is a rich green that stands out with its vibrant hue.

A halterneck style is flattering and we love the gold hardware detailing!

This luxe piece is stylish and sophisticated… It is a great addition to your holiday wardrobe and will work so well with a beach cover up for a 'beach to bar' look.

Click through to shop the bikini on the Heidi Klein website.

Or browse our carousel of similar styles from the likes of Asos, Melissa Odabash and more!

Back at it: Underwood kicks off her Las Vegas residency on June 21st

The Las Vegas residency Reflection of the seven-time Grammy winner is set to relaunch soon.

Carrie has been sharing shots of herself on Instagram over the past week as she rehearsed for the reopening of her Vegas residency at Resorts World.

The program is scheduled for six nights from June 21 to July 1. Additionally, there will be more shows in September.

On Saturday, Underwood put on a dazzling performance as she headlined Rogue Music Fest in Oregon.

Over 10,000 enthusiastic country music fans from various regions packed the Jackson County Fairgrounds as Underwood and her band played through her biggest hits.  

On Sunday, Carrie shared a carousel of images on her Instagram playing guitar and singing for the sold-out crowd. 

In January she said she is no longer working out to be 'a certain size'.

The singer admitted that her 'goals have shifted' over recent years, and she's now working out with the ambition of having 'energy and longevity'.