| Kevin Kline | Cole Porter |
| Ashley Judd | Linda Porter |
| Jonathan Pryce | Gabe |
| Kevin McNally | Gerald Murphy |
| Allan Corduner | Monty Woolley |
| Sandra Nelson | Sara Murphy |
| Keith Allen | Irving Berlin |
| James Wilby | Edward Thomas |
| Kevin McKidd | Bobby Reed |
| Peter Polycarpou | L.B. Mayer |
| Richard Dillane | Bill Wrather |
| Edward Baker-Duly | Boris Kochno |
| Natalie Cole | Musical Performer - "Ev'ry Time You Say Goodbye" |
| Elvis Costello | Musical Performer - "Let's Misbehave" |
| Sheryl Crow | Musical Performer - "Begin the Beguine" |
| Alanis Morissette | Musical Performer - "Let's Do It, Let's Fall In Love" |
| Caroline O'Connor | Musical Performer - "Anything Goes" |
| Angie Hill | Ellin Berlin |
| John Barrowman | Jack / Musical Performer - "Night and Day" |
| Nicola Dawn | Party Guest (uncredited) |
| Lara Fabian | Musical Performer - "So In Love" |
| Vivian Green | Musical Performer - "Love For Sale" |
| Mick Hucknall | Musical Performer - "I Love You" |
| Lemar Obika | Musical Performer - "What Is This Thing Called Love?" |
| Diana Krall | Musical Performer - "Just One of Those Things" |
| Robbie Williams | Musical Performer - "It's De-Lovely" |
| Harry Ditson | Dr. Moorhead |
| Tayler Hamilton | Honoria Murphy |
| Lexie Peel | Patrick Murphy |
| Greg Sheffield | Boath Murphy |
| Peter Jessop | Diaghilev |
| Jeff Harding | Cody |
| Susannah Fellows | Mrs. L.B. Mayer |
| Teddy Kempner | Stage Manager |
| Francesca Jaynes | Choreographer |
Composer Cole Porter creates hit songs for Broadway musicals, marries a beautiful socialite and has liaisons with men.
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