10/08/2013 AT 12:20 PM ET
The Keeping Up with the Kardashians star, 29, arrived at the Hollywood nightclub Tru just after midnight with a large group of friends Monday night that included her best friend Malika Haqq and rapper The Game (real name: Jayceon Terrell Taylor).
Clad in black skinny jeans, a T-shirt and a satin bomber jacket embroidered with the word “Girls,” Kardashian – who recently revealed her estranged husband Lamar Odom, 33, is very depressed – stuck close to Haqq throughout the night while hanging out at a table.
“She seemed really uncomfortable,” an onlooker tells PEOPLE. “She was constantly playing with her hair with her left hand almost as if to show off that she was wearing her wedding ring. It seemed very intentional.”
Sipping on a vodka cranberry and a glass of champagne throughout the night, Kardashian bobbed her head to the music and whispered occasionally with The Game, though “there wasn’t anything that made the two look like they were anything more than friends,” adds the source.
Just after 2 a.m., the reality star – who gamely posed for fan photos inside the club – headed out with her entourage.
Later, Kardashian fired off a series of Tweets about love.