Colleen (played by Natalie Zea) appears in the episode "We Called It Mr. Pinky".
Story[]
After a night of sex with Charlie, she says that she is in love with him, Charlie then merely says "Thank you." This lackadaisical attitude of Charlie annoys Colleen. Later in the episode they make up, though Charlie sees his mother's face on her while they are having sex causing him to scream in terror and scare her away.