Celebs owe a lot to their mothers -- they wouldn't be here without 'em, after all -- and on Mother's Day ... there was no shortage of gratitude.
Stars flooded social media with pics honoring their mamas -- and in many cases even themselves and/or their spouses -- including shots from Miley Cyrus, John Legend, Bella and Gigi Hadid, John Stamos, Mariah Carey, Kris Jenner, Cristiano Ronaldo, Ivanka Trump, Tom Brady, Kevin Hart, Bindi Irwin, Cindy Crawford, Ariana Grande ... and many, many more.
Hollywood hearts Mom.