Monaco's Prince Albert II is excited, anxious father-to-be

Princess Charlene of Monaco and Prince Albert II of Monaco attend the Rose Ball 2014 in aid of the Princess Grace Foundation at Sporting Monte-Carlo on March 29, 2014, in Monte-Carlo, Monaco.

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Prince Albert II of Monaco isn't holding back the superlatives when he talks about the baby that his wife is expecting later this year -- his first royal heir.

He told The Associated Press in an interview that he and Princess Charlene are "overjoyed," ''thrilled," and "very excited," and that the baby is due in December.

But they're also a little nervous. Speaking at the opening of the new Monaco Yacht Club on Friday, he said they are "taking every cautious step to make sure everything goes well."

Albert, now 56, was a longtime bachelor who has acknowledged fathering two children -- daughter Jazmin Grace Grimaldi and son Alexandre Coste -- out of wedlock. He married Charlene, a South African former Olympic swimmer, in 2011 and they announced last month they are expecting a baby. She is 36.