Brad Pitt and George and Amal Clooney were also in attendance

By Jacqueline Andriakos
Updated June 01, 2015 03:55 PM
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Christopher Polk/Getty; Barry King/FilmMagic

Chris Martin and Jennifer Lawrence were amongst a starry invite list at U2’s Los Angeles bash over the weekend.

After catching the rock group’s concert at the iconic Fabulous Forum in Inglewood on Saturday night, the Coldplay frontman, 38, and Hunger Games star, 24, were photographed leaving the afterparty Sunday evening at the Chateau Marmont in West Hollywood. The private celebration also attracted the likes of Brad Pitt and Angelina Jolie-Pitt , George and Amal Clooney, Lady Gaga and more.

The pair were spotted keeping a low profile in the back of a car with U2 frontman Bono as they left the party. Lawrence donned a sheer white tank top and jeans, while the “Fix You” singer wore a signature blue long-sleeve shirt and kept a hand on the actress’s leg in the backseat.

During the event, they “held hands and looked very happy,” a source tells PEOPLE.

Martin has been linked to Lawrence since August 2014. A source recently told PEOPLE that the British artist is “happier than ever” with the young actress despite their busy schedules.

“They have been spending a lot of time together,” says the source, who added that Martin has “made an effort to get to know her friends.”

On Saturday, Martin spent the day at Disneyland with his two children Moses and Apple, whom he shares with ex-wife Gwyneth Paltrow, 42.

The family hit the famed rides Splash Mountain, Big Thunder Mountain Railroad and the Matterhorn Bobsleds at the Anaheim, California, theme park. Moses, 9, and Apple, 11, also feasted on churros before heading home for the day.

Martin and Paltrow have remained amicable post-split, fitting in lots of family time while both pursuing other relationships.

After finalizing their divorce in April, the exes celebrated Memorial Day together at a barbecue hosted by producer Joel Silver and also toasted Mother’s Day with a family lunch in Santa Monica.

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Paltrow also recently took her new relationship with producer Brad Falchuk, 44, public last month when she brought him to Robert Downey Jr.‘s 50th birthday party.