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Among those celebrating the toddler's first milestone birthday in the comments were Mandy Moore, Nicole Scherzinger, Natasha Bedingfield and others.

Trainor previously opened up about Riley's traumatic birth in a conversation with Parents magazine, where the singer said she has PTSD after having to deliver her son via cesarean section. She added Riley had to spend his first five days in the neonatal intensive care unit because he had some breathing problems.

\"When I saw Riley in the NICU, all hooked up to these wires, I just saw the most adorable baby redhead I've ever seen,\" she said at the time, and doubled down that she hopes to give her little one multiple siblings. \"I'm gonna try to get to four... We'll see what happens after three. I'm not doing less than that. I need three.\"

She also shared how motherhood is influencing her creative process. \"I heard that when you have a baby, you get more creative, and my lyrics are changing,\" the Grammy winner said.

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