Nick Jonas is on the fetching side all the time, but perhaps none more so than when he's all aflutter over his niece.
Or make that nieces, because today he broke the news that brother Kevin Jonas and sister-in-law Danielle had welcomed their second child, daughter Valentina Angelina Jonas, who joins big sister Alena Rose in the family fold.
"AHH! I'm an uncle again! Congrats to my brother and sister in law on the birth of their new beautiful baby girl," Nick posted alongside a video announcement in which he also called it "the best news ever."
But Nick and Joe are hardly alone in the warm-and-fuzzy world of doting on your sibling's kids. Here are a bunch of celebs who are superstar aunts and uncles: