Madison Beer Kisses Justin Herbert on Sideline Pregame

Madison Beer and Justin Herbert shared a lightning quick interaction at the Los Angeles Chargers game Sunday … sharing a kiss on the sideline before the game!

The pop star stood just off the field at SoFi Stadium Sunday … hanging with a pair of friends when her footballin’ BF came over to say hello.

Like we said, it’s short and sweet … Herbo plants a kiss on Beer’s lips and shakes her friends’ hands before kissing Beer again and jogging off.

Basically, Justin’s in game mode … but he’s still taking his time to show his lady some love for coming out to support him.

As you know … these two were first linked romantically back in August — and we’ve shown you photos of the two walking around Los Angeles, celebrating his win against the Kansas City Chiefs back in Week 1.