What episode of friends did Julia Roberts appeared?

Answer 1

She appeared in series 2 in " The one after the Super Bowl" as Suzy Moss who plays a girl from Chandler's school but later becomes Chandler's girl friend. Although she is mad at chandler for pulling up her skirt during one of the school plays so when she takes him to dinner and goes into the loo with him, she steals all of his clothes, convinced him to wear her underwear and leaves him in the restaurant wearing nothing but women's underwear!

Answer 2

Yes she did, it was in the episode where she left Chandler in the toilets wearing just her underwear.