Stephens was kicked out of the Australian weight loss competition last week for sneaking alcohol into the house and getting drunk. Past contestant Whalan said that she was upset at Stephens because she thought he was a strong contender for the Biggest Loser title.
Whalan wrote in her official blog: "It's really such a shame, because I'd honestly picked Luke to be the force to be reckoned with this season. He's a powerhouse. I bet he is regretting his drinking binge now."
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She also revealed that she hopes Stephens gets some professional "help on the outside" for his drinking problem, adding: "It's such an opportunity to get selected on that show - to be expelled would be devastating to anyone (particularly someone who could have taken his place!)
"I have faith in Luke - he's a strong guy and appears to have learnt already the lessons in weight loss. Now he just needs to give up the booze and he's on the way to a much healthier and happier life."
Whalan also wrote that she has caught the "love bug" after witnessing four contestants getting romantically involved.
She continued: "I love that Hamish [Elliott] and Michelle [Cortesao] have both confessed their feelings towards each other this week… and I love that Lisa [Ritherdon] and Simon [Hurley] have also found something beautiful together. It is the theme of this season after all. Singles looking for love."
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