The former show winner was appearing on Alan Carr's Chatty Man with fellow judges Bruno Tonioli and Craig Revel Horwood when she went off script and glugged wine straight from the bottle.
Asked about the steamy dancing, the 33-year-old said: "Everyone is really frisky on the show, everybody is horny. The year I was a contestant, everyone just was really gagging for it.
"As I was saying... you spend eight to ten hours a day rubbing up next to each other. Of course you're going to get a bit frisky."
Bruno tried to shut her up by taking her glass and declaring "no more drink for Alesha!, but she foiled him by grabbing the bottle and tipping the vino straight down her throat.
Alesha also stoked the show's rivalry with The X Factor by doing a victory dance to celebrate beating it in the ratings when Alan Carr raised the subject, but then backtracked with a more diplomatic answer.
She said: "I don't understand what all the fuss is about, why can't we just enjoy both shows?
"I actually don't think the public give a s***. The public will just Sky Plus one and watch it later, they don't care."
And her subsequent apology on Twitter was half-hearted to say the least. She tweeted: "Apologies for being pickled on Alan Carr! I did have fun though!"