Ronni Wellema Costume in Theater and Film Final Part II Bradley Cooper as Lane Cooper Footman serving at the party. Arrival Outfit Sandra Bullock as Molly Tripold A titled relative of Sylvia McCordles from London who has brought her niece. Arrival Outfit Arrival Hat Tea Party Dress Tea Party Bracelet Emma Watson as Eileen Jones Molly Tripolds niece who is a stunning debutante. Arrival Outfit (Debutante Ball Dress) Tea Party Dress Tea Party Stockings Tea Party Pumps Tea Party Fan Meryl Streep as Rachel Smith Mabel Nesbitts mother from America. Arrival Dress Arrival Hat Arrival Bag Arrival Shoes (top) Tea Party Dress Tea Party Hat Robert De Niro as Harold Smith Mabel Nesbitts father from America. Arrival Suit Tea Party Suit (Minus Scarf and Gloves) Dave Franco as Sebastian Hastings A young lieutenant, fresh from Sandhurst, love interest of Sandra Bullocks niece. Sebastians Arrival Outfit and Tea Party outfit Robert Downey Jr. As John Herbert Art dealer from London who has come to buy paintings from the estate after the murder of Lord William McCordle. Arrival Outfit (Johns usual work suit) Tea Party outfit (more formal black suit) Tea Party Shoes