Lily Aldrin (Alyson Hannigan) is a kindergarten teacher and an aspiring artist. Lily was originall engaged to Marshall before they broke it off for her to try and be an artist in California. However, she returned to him after her fellowship ended and the two quickly married by the end of season two.
Barney: Guys, I just tasted an amazing caterer.
Lily: We already have a caterer.
Barney: Oh right! You're getting married. [to Ted] You see what I did there?
Barney: Oh, search your soul, Robin. You and I both know this wasn't about the money. Sure, Metro News 1 pays you jack. And, hey, a little green salad on the side is good for you, me and Mr. McGee.
Lily: Seriously, who talks like that?