Posing by the pool in Thom's parents Algarve villa, Kelly looked happy and curvy in a flattering leopard print swimsuit.
Kelly, 31, who is five months pregnant, told the magazine that although her baby was not planned, she would not change anything.
The couple have been been dating since November last year after meeting in a London nightclub.
They announced Kelly's pregnancy in March, revealing they were expecting a little girl. Zimbabwe-born Thom, 26, is a former Scotland international rugby star and a former teammate of Kelly's ex boyfriend Danny Cipriani.
Kelly, told Hello! 'That is what happens when you are in love - you surrender to whatever is to be. It wasn't a plan, but if it happened, it happened. We were boyfriend and girlfriend. I love Thom and Thom loves me. We love being together. It is as simple as that.'
The baby is due in September.
Do you agree with Kelly? Should you 'surrender to whatever is to be' or has this pregnancy happened just too soon in the relationship?
Kelly is just one of a long list of celebs due to pop in 2011! Check out the rest here!