Oprah Winfrey will be the very first guest on Piers Morgan Tonight, Breaking Celebrity News can confirm.

The American talk show queen has already done her interview for the highly anticipated CNN show, which is replacing legendary Larry King Live.

Audiences are in for a treat according to the British presenter, who revealed his debut guest at the Television Critics Association press tour and also on his Twitter.

VIDEOS: Goodbye Larry King! Tears & Tributes As TV Icon Hangs Up Suspenders

"OFFICIAL - 1st guests is @Oprah" he announced on the social networking site.

Morgan has been building hype over his first guest for the last few days, leaving fans to guess who the big celebrity guest would be.

He hinted that it was 'the biggest star on the planet' earlier in the day, before Tweeting:

"The star promised me 45 mins and gave me 90. Was hilarious, emotional, revealing and moving. Will be a brilliant 1st show."