A week before announcing her split from boyfriend of 10 years Joshua Jackson, Diane was in Tuscany at Rosetta Getty's party with Norman Reedus. A few months ago it was claimed that she cheated on Josh with Norman (ONTD post about it: 1 and 2).
Lainey from Lainey Gossip claims that there were official pictures of Diane at the party, but were suspiciously taken down, so the only proof is this picture of the back of her head while she's sitting right next to Norman
Other blind gossip websites claimed the same at the beginning of july, adding that the new couple has been traveling together all over Europe in the latest weeks.
SOURCES: First Tweet - LaineyGossip - Picture 1 - Picture 2 - Second Tweet - Third Tweet