Lisa Snowdon almost suffers second bikini malfunction as she tries to adjust gingham two-piece in Miami

She nearly suffered a bikini malfunction yesterday - but Lisa Snowdon was almost caught out again for her second day in the Miami sun. The 39-year-old beauty, who is taking a break from shooting the latest Marks And Spencer advertising campaign in Florida, had swapped her skimpy two dark piece of yesterday for some rather sturdier and some would argue even nicer swimwear.

The model appeared to be determined to keep her charms quite literally in check for her second day on the beach in a rather more supportive white and blue gingham swimsuit with cute little red bows.But her plans almost went awry when it came to lying down on a sunlounger and she decided to lower bikini straps to avoid those pesky tan lines - and almost fell out of her top.

Ooops! Lisa Snowdon almost revealed more than she intended again as she rolled down her bikini strap to avoid tanlines in Miami

Lisa thinks better of her plan and pops her straps back up Lisa almost exposed more than she intended yesterday too when her top rode up as she emerged from the surf.

However, she's been covered up during her shoots for the Marks And Spencer new television advert for their spring/summer collection, the reason for the star's trip out there. The 95.8 Capital FM breakfast show host has left Johnny Vaughan back in chilly London for the assignment, which also stars Twiggy, 61, Dannii Minogue, 39, VV Brown, 27, and Ana Beatriz Barros, 28.

That's the way to do it! Lisa shows that her top can stay in position sometimes even without straps

The star decides she's had enough sun and gets ready to go

The model looks great in a simple white kaftan to cover her bikini as she leaves the beach

She Tweeted: I'm only away for a bit, filming for the new M&S ad! Be back soon on breakfast with Johnny! Miss you and him already! L x' Johnny is soldiering on behind the mic meanwhile with stand-in host Kat Shoob while Lisa is away hard at work in the sun.

The gingham and white bikini had looked more supportive than her two piece

Dannii has certainly been impressed with the clothes they've been modelling so far, and Tweeted: 'Just to let you know the M&S Spring Summer collection is Uh-Mayzing!' The girls have been filmed posing in nautical gear on yachts, in their gladrags at a fictional wedding and in swimwear whilst lounging on the beach.

Eek! Lisa had to make some urgent adjustments to her bikini top as she emerges from the surf in Miami

The gang appear to having a fun time on the assignment, and have all been socialising during the evenings off the set - they've even brought friends and family in tow, with Dannii bringing partner Kris Smith. However, the shoot is almost over, and Dannii jetted out from Miami today to fly back to Melbourne, with Lisa set to return to London by the weekend to resume her breakfast show duties in the capital on Monday.

Twiggy, Dannii Minogue, VV Brown, Lisa and Ana Beatrix Barros strutting their stuff for the new Marks and Spencer advert in Miami Beach