Showbiz
Rex Features
The two couples shared a meal at Los Angeles's Chateau Marmont after midnight, according to Life and Style Weekly.
Diaz and Butler were allegedly the more confident pairing, holding hands during the meal underneath the table.
A source said: "They arrived at 12.30am and grabbed a table on the patio. Cameron snuggled up to Gerard and rested her head on his shoulder.
"Jake and Reese were really cute together too, joking a lot and just very comfortable with each other.
"Cameron was the centre of attention. Reese threw in an occasional wisecrack, but Cameron was really on a roll."
The witness added: "Cameron and Gerard held hands under the table, but Reese and Jake were slightly less affectionate."
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