The 31-year-old transsexual, who revealed his former gender before entering the house last night, shocked Adam and Lydia in the garden.
Both were initially confused by the news, with Lydia wrongly assuming Luke was a hermaphrodite and Adam later asking whether he was originally a man.
After Luke assured the pair that they could ask him "anything", Lydia comforted him by saying: "I think everyone in here is very open-minded.
"You're in the best house for the situation you're in, because you're with people who will 100% support you."
Luke was earlier seen battling with his secret, being heard thinking aloud: "I really didn't think this through."
