The Spanish beauty, who is on holiday with her two daughters, strolled by the pool in the strapless two-piece, with a bright red hat keeping the sun off her head.
She kept busy, ferrying drinks to and fro for her children and clutching Mickey Mouse armbands.
Keeping cool: Elen Rives wore a black bikini by the pool in Florida
Hat's the way to do it: The Spanish beauty kept off the sun with a red cap
Earlier, the WAG stripped off to reveal a gold one-piece suit.
After Frank took a beating against Manchester United over the weekend, the sight of his fiancee in the cutaway costume was sure to rub more salt in the wound.
Elen has been on holiday in Florida for almost a week but even in the 80F heat, kept her bottom half under wraps.
Smokin: Elen Rives shows off her toned figure in a metallic one-piece cut at the sides while on holiday in Florida yesterday
Doting mother: Elen takes a cooling dip in the pool
But the soaring temperatures eventually got to her as she removed the white sarong for a cooling dip in the pool.
And by the looks of things, Elen, 29, had no reason to be so shy.
The mother-of-two showed off her toned body in the sexy backless bathing suit, cut off at the sides, while doting on her daughters, Luna, two; and Isla, 18 months.
Meanwhile, Frank has been busy in London after the 30-year-old spent last week partying with his teammates at Mayfair hotspot Whisky Mist.
Under wraps: The WAG kept her bottom half covered for days before stripping off
The Chelsea players were out after their appalling 1-1 draw with Southend, and to see off team mate Wayne Bridge - who had just signed for Manchester City.
Lampard insisted that Chelsea were still well placed to catch leaders Liverpool in the Premiership race.
'We've dropped some easy points over the last few weeks but no one has pulled away, we're all starting pretty much level.' said Lampard.
While his fiancee soaks up the sun, Frank Lampard works hard at a Chelsea training session today
