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Bruce Willis, daughter Rumer Willis and Demi Moore in New York in 2011
Photo: Bruce Glikas / FilmMagic
US actress Demi Moore, 60, and her ex-husband Bruce Willis, 67, will become grandparents.
Their eldest daughter Rumer is expecting their first child with boyfriend Derek Richard Thomas.
The 34-year-old actress and musician posted multiple black-and-white photos on Instagram Tuesday showing Rumer with a baby bump.
Demi Moore responded enthusiastically: "Step into my hot crazy grandmother era," the actress wrote on Instagram.
Congratulations from prominent companions came straight away: "Welcome to the club," wrote Maria Shriver, the niece of assassinated US President John F. Kennedy and ex-wife of Arnold Schwarzenegger.
Actresses Gwyneth Paltrow and Michelle Pfeiffer also congratulated.
Rumer is the eldest child of Willis and Moore.
The couple were married from 1987 to 2000 and have two younger daughters together: Scout, 31, and Tallulah, 28. Willis married Emma Heming in 2009 and they have two daughters together.
The two families are closely related.
They all recently posed for a photo together in front of a decorated Christmas tree.
The close bond was also evident last March, when Willis announced the end of his film career due to illness.
He had been diagnosed with aphasia, a speech disorder acquired through illness.
"This is a really challenging time for our family," they said to their fans at the time.
"We are so grateful for your continued love, compassion and support."
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