The new couple was first spotted in New York City at a Rangers hockey game earlier this month in a full makeout session and most recently they were caught in Hollywood sneaking in kisses in the backseat of a car.
The comedian and the British actress were snapped making out after attending the premiere of the Netflix movie, "The Dirt," about the rise of the Mötley Crüe band. Davidson, 25, is featured in the film.
In the pic, he's seen leaning in to kiss his girlfriend, 45, who donned a black mini for the evening out.
Davidson recently addressed the media attention surrounding his new relationship on "Saturday Night Live" and said their large age gap "doesn't really bother us."
"So if you have questions about a relationship with a big age difference, just ask Leonardo DiCaprio, Jason Statham, Michael Douglas, Richard Gere, Jeff Goldblum, Scott Disick, Dane Cook, Derek Jeter, Bruce Willis, Harrison Ford, Tommy Lee, Alec Baldwin, Sean Penn and whoever the president of France is," Davidson said on the air.
"Mel Gibson, Billy Joel, Mick Jagger, Sylvester Stallone, Eddie Murphy, Kelsey Grammer. Larry King, Larry King, Larry King, Rod Stewart and Donald Trump," he added.