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Musician Pete Wentz and longtime partner Meagan Camper have welcomed a daughter. Wentz shared the news on Instagram on Sunday night by posting: "So excited to introduce Marvel Jane Wentz. Feeling so grateful that she's here and she's already ready to takeover the world. Happy Mother's Day Meagan Camper and all the moms out there. We love you,". Baby Marvel is Wentz's third child and first daughter as he's already father to 9-year-old son Bronx Mowgli (with ex Ashlee Simpson), and he and Camper welcomed their son Saint Laszlo in August 2014.