The 38-year-old actor, who plays midwife and gay dad Marcus Dent in the Weatherfield serial, still keeps in touch with the 'Smile' singer, PA reports.
Condou told Inside Soap: "I suppose Lily Allen's pretty famous! I babysat for her when she was 10!"
Referring to his daughter Georgia, Condou said: "Georgia is fantastic, and she's now getting to that age where she's really starting to interact with me and being absolutely hilarious.
"I think the 'terrible twos' could very well be on the way, though. She's beginning to get some opinions of her own - and she's also just learnt to say 'no'!"
Fellow Corrie cast member Kym Marsh recently announced that Condou will soon be a father for the second time.
> Charlie Condou: 'I'm staying in Coronation Street'