Leah Messer, 27, was right by her sister Victoria’s side for the arrival of her nephew, Caí River Rodríguez Messer, on Jan. 20! Apparently, the MTV camera crew was, too, judging by photos that both sisters shared to Instagram shortly after Victoria, 25, gave birth to her third child and very first baby boy. “We’re so in love with you Caí River Rodríguez Messer & Im so proud of you sister,” Leah wrote, and the caption accompanied a sweet slideshow that documented the delivery experience.