What is the fine-grained topic of the following text: More than 24 hours after "Dancing with the Stars" pro champ Maksim Chmerkovskiy shared an Instagram photo of pregnant fiancee Peta Murgatroyd applying make-up in a hospital bed, uncle-to-be Valentin Chmerkovskiy shared an update with curious fans via Instagram on Jan. 3. Only return the topic.
Update on Peta Murgatroyd's pregnancy shared via Instagram by Valentin Chmerkovskiy