Finneas is showing support for Billie Eilish’s budding relationship with musician Jesse Rutherford.

“Listen, as long as she’s happy, I’m happy,” the singer-songwriter and record producer told E! News on Thursday while attending GQ’s event for their Men of the Year issue.

READ MORE: Finneas Suffered Several Injuries And Underwent Surgery After Electric Bike Accident

Finneas’ comments come just two weeks after his younger sister and The Neighbourhood’s lead vocalist made their red carpet debut at the 11th Annual LACMA Art + Film Gala in Los Angeles, where they wore matching designer pyjamas.

READ MORE: Billie Eilish Spotted Smooching Boyfriend Jesse Rutherford In Public

On Nov. 1, the couple made their romance Instagram official when the “Happier Than Ever” singer shared a carousel of photos from her spook-tacular Halloween weekend, including one of their couples costume.