Credit: James Devaney/

Seth Meyers is madly in love with girlfriend Alexi Ashe -- and now all of Madison Square Garden knows it!

The Saturday Night Live funnyman, 38, and his lawyer love packed on the PDA in front of thousands during the Philadelphia 76ers vs. the New York Knicks game in NYC Sunday.

Meyers met Ashe at a wedding, and she's been his No. 1 fan ever since. When he hosts events such as the ESPY Awards, "she laughs at his jokes just as hard as the rest of the room!" a source told Us Weekly in 2011.

Things are getting serious for the New York-based couple, who've been together for several years. "They are incredibly solid," the source explained to Us. "Marriage is on the horizon."

Tell Us: Are Seth Meyers and Alexi Ashe a cute couple?