She gave birth to daughter Blue Ivy just three months ago, but Beyoncé has wasted no time in showing off her post-baby curves.

As she hit the beach in St Barts with husband Jay-Z, the 30-year-old star proudly displayed her womanly curves in a modest one-piece.

Beyoncé looked stunning in the plunging black swimsuit, which featured a cute frill around the waist, as she cooled off after some sunbathing with a dip in the sea.

Hot mama! Beyoncé showed off her curves in a sexy but modest one-piece as she hit the beach in St Barts

Post-baby curves: Beyoncé looked stunning in the plunging black swimsuit, which featured a frill at the waist

The superstar singer wore her honey-blonde hair tied back in a short ponytail, and teamed her ensemble with a dark pair of sunglasses, a lariat-style necklace and small gold earrings as she made the most of the sunshine.

As she slowly made her way into the sea, Beyoncé looked happy in relaxed – raising her arms up to her sides at one point with delight.

Hair today…: Beyoncé was sporting a long plait at one point, before displaying a shorter ponytail below

Excited! Beyoncé waded into the sea for a quick cool down

Beyoncé’s trip in the sea came after she was spotted spending some alone time with Jay-Z on the white sands, as the pair took the opportunity to have a few hours off from their baby daughter.

The superstar couple spent today on the beach where they lay on the sand and soaked up the sunshine.

Motherly instincts: Beyonce cradles Blue in a baby carrier while clutching a camera to capture magic moments

Beach babe: Singer clutched a pair of denim shorts as she made her way back up the beach after her swim

Careful! Beyoncé bent down as she accidentally dropped her shorts on the sand

They have had very hectic schedules since the birth of their first child so appear to be making the most of their Caribbean getaway.

And they seem to be taking to parenthood like ducks to water as they make sure they have some quiet time as a couple as well as doting on their little one.

They certainly seemed to be winding down as an ice bucket rested behind them which contained a bottle of wine and several bottles of water, while Jay-Z also sipped juice from a coconut.

Life’s a beach: Beyoncé and Jay-Z enjoyed some alone time today during a sun-soaked St Barts holiday

Winding down: The pair appeared to have ordered a bottle of wine to help them relax

Yesterday the pair were seen toting little Blue Ivy as they made their way onto a waiting boat.Beyoncé cradled her precious cargo as she made her way on board.

The singer wore a pair of short denim shorts, teamed with an orange blazer and white T-shirt for the day out, while Jay-Z donned a Breton striped T-shirt and blue shorts.

Like newlyweds: The couple only had eyes for each other while engrossed in conversation

Drying off: Beyonce draped a kaftan over her as the temperatures dropped on the walk home

But while Beyoncé and Jay-Z certainly appear to be enjoying their break, their relaxing time will soon be over as the new mother is scheduled to make her musical comeback next month when she performs three concerts over Memorial Day Weekend at Revel Beach’s Ovation Hall in New Jersey.

The holiday comes as the singer and her rapper husband are reported to have renewed their wedding vows in celebration of their fourth anniversary earlier this week.

The power couple are also understood to have exchanged new rings as they stood before celebrity guests including Oprah Winfrey, according to MediaTakeOut.com.

Flashing her famous grin: Beyonce beams widely, as she stretches her legs during a lunge

Family fun: Yesterday the power couple took three-month-old Blue Ivy on a boat trip

The website reports that the pair said ‘I do’ again in a ‘moving’ ceremony which happened at midnight on their wedding anniversary, April 4.

Beyonce’s new ring is apparently yellow gold like Jay-Z’s, according to an insider who spoke the website – although it is yet to be sighted. She already has a diamond band from her 2008 nuptials to the music mogul.

Baby on board! The pair looked cool and casual as they made their way on board the boat

Mummy and daddy time: Last week, Beyoncé and Jay-Z were seen taking a romantic stroll around in St Barts