The businesswoman revealed her killer curves as she peeled off to a gold, tasselled bikini after jetting out to the Spanish town - also popular with the 'TOWIE' cast - for the weekend.
Luisa - who lost out to Leah Totton in the final of the BBC show fronted by Lord Sugar - was only too happy to put on a show for the cameras as she soaked up the Spanish sun around her hotel pool.
She was also pictured larking around with pals including her former co-star Zeeshaan Shah, as they attempted to push each other in the water.
Luisa later tweeted: "My last night in Marbella tonight.... had a great weekend break ready to go home and play with my princess tomorrow!"
It was announced last week that the baking entrepreneur is to co-host this year's British Young Business Awards alongside government minister Vince Cable.
It was also rumoured that she had landed her own TV baking show, following her success on 'The Apprentice'.