See pictures of Kate Middleton and Queen Elizabeth II greeting Helen Mirren and other stars at Buckingham Palace on Feb. 17. Credit: David Crump/WPA Pool/Getty Images

Roll out the royal red carpet! Kate Middleton and Queen Elizabeth II welcomed movie stars to Buckingham Palace on Monday, Feb. 17. The 87-year-old Queen and Prince William's wife, 32, hosted a reception for the dramatic arts along with Prince Michael of Kent.

Middleton showed off her slim figure at the event in a red Alexander McQueen dress while standing alongside the Queen to greet guests. The new mom wore the same dress to the Thames Diamond Jubilee Pageant on the River Thames back in June 2012. The Duchess accessorized the look Monday by carrying an Anya Hindmarch "Maud" clutch, wearing Cassandra Goad "Temple of Heaven" earrings and Prada shoes.

Monday's reception was held to honor Britain's theater and film talent, and was attended by actors, playwrights, teachers, producers and directors. Among the stars in attendance were Helen Mirren, Uma Thurman, Hugh Laurie, Helena Bonham Carter, Joan Collins, Joely Richardson, Gemma Arterton, Roger Moore, Steve McQueen, Harvey Weinstein, Ralph Fiennes, and Angela Lansbury.

The Queen and Middleton chatted with a small group of the invited 250 guests in the White Drawing Room before moving into the Ballroom for a series of short performances, including students of RADA performing from Oh! What a Lovely War.

On Sunday, Feb. 16, Middleton's husband Prince William awarded Mirren with an academy fellowship at the BAFTAs in London. While presenting the award, William, 31, jokingly referred to Mirren, 68, as "granny," as she has often portrayed the Queen in film.

When Middleton met Mirren on Monday she joked to her: "I hear my husband called you granny last night."