The Sun exclusively revealed how Harry Styles secretly kissed

co-star Florence Pugh on the set of their film

weeks before he began a relationship with the director, Olivia Wilde.

The snog is understood to be the real reason the two women fell

out while filming Don’t Worry Darling.

A source told us: “Harry and Florence had chemistry from the off, which translated incredibly well on-screen.

“One night they had a bit of a snog, all very light-hearted and a bit of fun, and that was that.

“It was being gossiped about by a couple of members of production, otherwise no one would have known.

“Harry was very much single at the time and Florence had separated from Zach Braff,

although she’d kept the split quiet to — ironically — avoid headlines.

“There was no cheating or misbehaviour from anyone.