Tum-ting to tell us Anna? A rounded Miss Kournikova has her belly kissed by beau Enrique Iglesias

Last updated at 5:51 PM on 19th November 2011

The model was taking a leisurely boat ride in the Miami heat with a slightly swollen belly.

Anna, 30, was wearing a tiny white bikini for the trip while her boyfriend Enrique Iglesias drove the boat.

As one of the world's most recognisable sportswomen, Anna is normally in great shape all year round but appeared to be carrying a little bit of extra weight on her belly.

All white: Anna Kournikova enjoys time on a boat in Miami yesterday

All on deck: The former tennis star looked a little out of shape in her bikini

The small bulge will make people suspect it is a baby bump as the couple have been the subject of baby rumours before.

The celebrity couple have always remained quiet about their personal lives together but consistently put on a public display of affection while on their love boat yesterday.

Enrique couldn't keep his hands off his Russian girlfriend and at one point was seen kissing her belly.

Just the two of us: As Anna sits and read a magazine her boyfriend kisses her belly

What is she looking at? Anna stares downwards as Enrique steers the boat to dock

Looking healthy: Anna and Enrique have been in Miami for the Latin Music Awards

The lovers frolicked on the boat for around an hour before they docked nearby to check on their new home.

The pair have invested $20 million in a mega-mansion that is being built on a private island in Miami.

They met the building foreman and were shown around the structure and told how it all would look once completed.

Does my bum look bi in this? Anna checks out her backside after putting on some shorts

Anna and Enrique have been together for ten years and she said last month that their relationship was strong.

She said: 'I believe in commitment. I believe in being open and trusting each other and respecting each other completely.'

The former tennis pro also plans on having children, regardless of whether or not her 36-year-old pop star boyfriend is ready.

Relaxing in the sun: Anna looked chilled but had definitely put on a bit of weight

All aboard the love boat: The pair looked incredibly close as they enjoyed the warm weather

'I absolutely want to have children, whether I have my own or adopt,' she says, adding, 'I love taking care of people.'

Anna unexpectedly left 'The Biggest Loser' after just one season as a celebrity trainer.

Is that for just you two? The mansion is on its own private island

What a mess: Enrique and Anna stand and survey their future mansion

She told The Hollywood Reporter: 'I enjoyed my time on the Biggest Loser ranch. Although I will not be returning as a full time trainer on season 13, I will always be a part of The Biggest Loser family and my commitment to bettering lives through health and fitness will continue'.

The couple are in Miami because Enrique has been nominated for favorite Latin music artist at Sunday's American Music Awards which are held in the city.

Look to the future: The couple are shown what will be from the second floor