The couple were far more interested in each other than the star-studded concert happening around them

By Amanda Michelle Steiner Abby Stern
December 15, 2014 12:15 PM

Miley Cyrus and Patrick Schwarzenegger‘s budding relationship still appears to be going strong.

At the 25th Annual KROQ Almost Acoustic Christmas concert in Los Angeles on Sunday, the couple couldn’t keep their hands off of each other.

Cyrus arrived at the venue first, taking in the concert with five friends, including BFF and assistant Cheyne Thomas. She covered up her wrist injury with an oversize sweater dress, black tights, and black patent leather Doc Martens.

While Cyrus, 22, seemed to be in great spirits – laughing, smiling and taking selfies with her friends – she was immediately perked up when Schwarzenegger, 21, arrived during the Smashing Pumpkins‘ set.

When he sat down, she threw her arms around his neck and they kissed, engaging in PDA as if they hadn’t seen each other in weeks.

Quite the opposite, in fact: Only the day before, the two also shared time together at a charity event benefitting the St. Jude Children’s Hospital at the Brooks Brothers store on Rodeo Drive. The couple were holding hands, an onlooker tells PEOPLE, and seemed as happy as ever as they took photos with the event’s 14-year-old DJ, Oscar Adler.

At Sunday’s concert, the couple kissed constantly, whispering in each other’s ears. At one point, the “Wrecking Ball” singer even sat in her boyfriend’s lap.

Given how into each other this pair seems to be, it must be a relief to them both that his mother, Maria Shriver, is happy for her son, despite various reports alleging the opposite.

With reporting by MELODY CHIU