Luisa Zissman posts skimpy bikini pictures of herself online before final of Apprentice is shown on BBC1

Apprentice finalist Luisa Zissman has raised the heat on her rival by posting a picture of herself in a bikini and tweeting: “At least I’m not boring.”

The 25-year-old is vying with Leah Totton, 24, to be chosen as the winner of this year’s show and secure a £250,000 investment from Lord Sugar.

Zissman, 25, posed in swimwear and hit the town in a revealing bright red dress.

Zissman, who was celebrating a friend’s birthday in Vegas, has also holidayed to Thailand recently with fellow finalist Leah Totton.

There, she again showed off her sleek figure in a string of risque outfits.

She is hoping Lord Sugar will invest £250,000 in a baking supplies company as she seeks to build on the success of her cake businesses.

But she is up against Totton, a 24-year-old WAG turned doctor who dated Celtic goalkeeper Fraser Forster for four years.

She wants Lord Sugar’s investment to open clinics offering lunchtime injections of Botox and facial fillers.

The final is broadcast on BBC1 at 8pm tonight.