S8, E10: Chandler becomes upset when Monica spends a fortune on a luxurious pair of black boots. After she discovers that the sexy new shoes hurt her feet, Monica continues to wear them, rather than admitting that Chandler was right to be concerned. Meanwhile, celebrity-obsessed Phoebe learns that Ross' son, Ben (recurring guest star Cole Mitchell Sprouse), attends the same school as the son of rock star Sting. She tries to meet Sting and get tickets to his upcoming concert--until she encounters his suspicious wife, Trudie Styler (herself). Also, Rachel tries to mediate between an angry Joey and his pregnant younger sister, Dina (Marla Sokoloff - "The Practice").