Fergie boosts her cleavage in a halter-neck bikini

My Humps! Fergie displayed her trim, toned and yet still curvy figure in a bikini as she enjoyed a day at the beach in Florida on Friday

She spent the weekend in full wedding mode, acting as the bridesmaid for a close friend in Florida.

But before Fergie got her gown on for the Saturday ceremony, she kicked back with a group of friends on Palm Beach on Friday, soaking up the sun and topping up her tan.

The 40-year-old looked utterly incredible as she showed off her bikini body while frolicking in the ocean, her lean figure no doubt the envy of everyone else at the idyllic location, reports dailymail.

The Black Eyed Peas singer showed off her svelte and subtly muscular physique in a tiny plunging two-piece, complete with colourful stripes in autumnal tones.

The bikini briefs were incredibly tiny, barely covering her shapely derriere, but it was her ample cleavage in the halter-neck top that really stole the show.

She also revealed enviably toned abs: known for her fit and healthy lifestyle, it's clear to see the mother-of-one's hard work has well and truly paid off.

She's got it: The 40-year-old star showed off her amazing figure in the tiny two-piece swimsuit, while putting herself at risk of spilling out of the top by running through the sea

Enviable: The toned and tanned Black Eyed Peas star spent a day on Palm Beach with her fellow bikini-clad pals

Getting soaked: She took a dip in the sea, while keeping her blue-tinted aviators firmly on her face

The gorgeous singer's long tresses were kept down as she spent time in the cool blue ocean with a female friend, wet and wavy and perfectly beachy.

Fergie - whose real name is Stacy Ann Ferguson - also donned a pair of reflective blue aviator shades to protect herself from the hot Florida rays. 

She let her hair down as she got herself soaked in the water, playing around with a couple of bikini-clad friends.

And, as the group made their way back up the beach along the sand, Fergie gave onlookers another glimpse at her trim, toned body.

Playing around: The three ladies spent time in the water holding hands and generally mucking about

She's got some front! Thanks to her very daring halter-neck bikini, Fergie's cleavage looked better than ever

Those abs! As she emerged from the cool water, Fergie gave a glimpse at her rock-hard torso

Fun in the sun! The ladies didn't hold back as they played around, running about in the surf

It's a hard life: She showed off her best Baywatch babe impression, jogging through the shallow water as her friend tried to hold her own bikini up in place

Not present for the beach outing was Fergie's handsome husband, actor Josh Duhamel, or their one-year-old son Axl.

However, the Transformers actor, 42, was present for the wedding the following day, which saw two of their female friends - Forman Lauren and Angela Weaver - tie the knot, in Boca Raton.

Taking some time out from the strong sunshine, Fergie slipped into a black kaftan while seeking shade under a parasol up on the beach on Friday. 

Watch out! At one point, the Big Girls Don't Cry hitmaker almost looked like she was going to trip

Enjoying the day: It was a girly afternoon for Fergie, whose real name is Stacy Ann Ferguson

Lucky man: Fergie's husband Josh Duhamel wasn't at the beach with his wife, as she flaunted her impeccable physique

Where'd she get those abs? Mother-of-one Fergie is a big fitness fan and works hard with punishing dance routines up on stage, so her rock-hard physique isn't such a mystery

Off for a rest: The bikini-clad beauties left the ocean for a while to get some relaxation

Rear-ly nice: As she enjoyed some time in the shade while wearing a sheer black kaftan, Fergie proved she's got an enviable derriere, too

The sheer garment clung to her petite curves in a very alluring manner and, thanks to its short length, it also exposed her rounded and squat-toned derriere for all to see. 

Fergie was all-smiles for her idyllic day on the beach, no doubt feeling excited about the day to come.

And she was also perhaps keen to top up her tan one last time before slipping into the stunning full-length black gown she wore to see her pals down the aisle.  

And... stretch! She could barely take the grin off her face as she relaxed with her group of pals, the day before acting as a bridesmaid at a wedding in nearby Boca Raton

Chilling: The singer's hair dried in the shade, showing off her honey blonde locks while also displaying those lovely legs some more

Catching up: The busy star and mother of baby Axl was no doubt thrilled to take some time out of her busy schedule to spend time with her friends

Trim and toned: The star proved she has a body to die for during her day on the beach

A-list couple Fergie and Josh were clearly the talk of the ceremony, with one guest excitedly tweeted pictures of her grand mother meeting the pair. 

And last week, Fergie also shared an Instagram post of the wedded couple's bridal shower, captioning it: 'Happy #BridalShower @formanlauren & @angaa02. #ladiesfirst #queenlatifah #monielove'.#

The family returned from there weekend trip early on Monday, and were spotted making their way through LAX together.