Per the Cour Grand-Ducale de Luxembourg:

“Their Royal Highnesses The Grand Duke and The Grand Duchess are very pleased to announce that Prince Félix and Princess Claire are expecting their first baby.  

Birth is expected to take place in June. 

The Grand Duke, The Grand Duchess, Grand Duke Jean and members of the Royal family as well as the Lademacher family are delighted with the news.”

Photo courtesy of Zimbio