Valentino Valentini testified Friday at Berlusconi's trial on charges of having underage sex with Karima El-Mahroug that Berlusconi brought up the supposed relationship during a lunch he hosted for Mubarak, then the president of Egypt, The Daily Telegraph reported.
Former Agriculture Minister Giancarlo Galan confirmed the conversation with Mubarak when he took the stand.
"There was then a rather confused conversation," Valentini said.
Mahroug, who performed under the name Ruby, met Berlusconi in 2010. The prime minister allegedly invited her to at least one of his "bunga bunga" parties, had sex with her and pressured police to release her when she was arrested in Milan.
Valentini said Berlusconi told him a few days after the arrest that everything Ruby had said to him was "a load of balls."