Prince Williams, Duchess of Cambridge Prince Williams, Duchess of Cambridge

Kate Middleton and Prince William might have an extra special fourth wedding anniversary. The royal couple's second child is due in April, the Royal Palace said in a statement.

Last month, it was announced that Middleton, 32, was pregnant and had been experiencing bad morning sickness. She's currently still suffering from Hyperemisis Gravidarum, but the Palace says "her condition is steadily improving."

Photos: The road to the Royal Baby

The Duke and Duchess of Cambridge will celebrate their fourth wedding anniversary on April 29. Their first son, George, turns two on July 22.

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