Ryan Seacrest can start practicing his “THIS … is American Idol” line again … he’s finally inked his deal to return as host after months of intense negotiations.

Ryan confirmed the news Thursday on “Live with Kelly and Ryan” … saying he was excited to return, and likened it to getting back in a relationship after an abrupt breakup.

TMZ broke the story … Ryan was getting anywhere between $10 and $15 million but the huge hangup was getting the coveted executive producer credit. It’s unclear if he scored that.

There were also logistical challenges. Ryan — as first reported by TMZ — would fly back and forth from NYC to L.A. to shoot ‘A.I.’ … but a plan was hashed out so none of his jobs would be affected … including his radio gig.