Lily and Robin met each other in the second episode, Purple Giraffe, after Lily recognizes Robin from her news show. Robin and Lily seem to be really good friends, hanging out and shopping together. In The Wedding Robin confesses to Lily about her feelings for Ted, who tells her to tell Ted about it. Lily says in Arrivederci, Fiero that they became best friends by keeping a secret together. Lily is supportive of all of Robin's relationships, that she had known, from Derek to Don.