The 90210 star was far from shy with model Aaron O'Connell Saturday while hosting a party at Lavo Las Vegas, walking into the club hand in hand and never leaving each other's sides.
Inside, McCord and O'Connell were seen flirting with each other in their VIP section, taking pictures together on their personal cameras and drinking Veuve Clicquot champagne. Later, she was spotted sitting on his lap.
"They were all over each other," an observer tells PEOPLE. "There were definitely not trying to hide anything. They were dancing all over each other and didn't separate."
Dressed as the White Queen from Alice in Wonderland, McCord could also be seen wearing O'Connell's hat, an accessory to his pilot costume.
Earlier this month, McCord, who told Ryan Seacrest in September she was "very with" Twilight hunk Kelan Lutz, and O'Connell were at a benefit in Los Angeles for The Homes That Hollywood Built, a benefit for the St. Bernard Project which helps supply housing for those who lost homes in Hurricane Katrina.
A rep for McCord did not immediately respond for a request for comment.