The One with Ross's Step Forward (S08E11)

Ross becomes nervous when his new girlfriend, Mona (recurring guest star Bonnie Somerville), wants to mail cute Christmas cards with both of their pictures on it. When Rachel starts feeling the hormonal effects of her pregnancy, she desperately searches for possible romantic partners - including the always accommodating Joey. Meanwhile, newlyweds Chandler and Monica must deal with Chandler's boss, who is enduring a divorce. (Warner Bros. UK)