Perez Hilton has expressed regret for his past habit of outing celebrities who were keeping their sexuality private.The US blogger has released a new memoir titled TMI: My Life in Scandal, which details his 16 years as a celebrity gossip writer. Hilton, whose real name is Mario Lavandeira, was notorious in the Noughties for his practise of outing stars including singer Clay Aiken, and N’Sync member Lance Bass.