Robert Downey Jr, Chris Hemsworth, Mark Ruffalo and others celebrate Mother’s Day

Robert Downey Jr shared this adorable photo and wrote, "This Mother’s Day, more than ever, let’s honor the women that raise the children that inherit the Earth #happymothersday" (Photo: Robert Downey Jr/Instagram)

Sharing this picture on Instagram, Chris Hemsworth wished all the mothers a very happy Mother's Day. (Photo: Chris Hemsworth/Instagram)

Mark Ruffalo shared a throwback photo on Instagram with a caption that read, "Happy Mother’s Day, Mom! Thank you for bringing me into this beautiful world and making us your beautiful world. You love being a Mom. I so appreciate your kind loving care and for believing in me when no one else did. Thank you for making me stick to acting. I love you so much. Happy Mom’s Day." (Photo: Mark Ruffalo/Instagram)

Chris Evans too shared a throwback photo, wishing his fans on Mother's Day. (Photo: Chris Evans/Instagram)

Will Smith wished his mother a very happy Mother's Day with a couple of pictures. (Photo: Will Smith/Instagram)

Sharing a picture of Denise Jonas and Priyanka Chopra's mother Madhu Chopra, Nick Jonas wrote, "So grateful to have such an incredible mother and now mother in law. #happymothersday" (Photo: Nick Jonas/Instagram)

Friends star Courteney Cox shared an adorable photo with a caption that read, "Here we are, my mom, Coco and me wrapped together in our generational trifecta. I am so grateful to be my daughter’s mother, and my mother’s daughter. This is just one of the many beautiful memories I will always treasure. Whether I’m right next to you in the ocean, or oceans apart, I love you always Moma. Wishing you a very happy Mother’s Day!" (Photo: Courteney Cox/Instagram)

Jennifer Lopez shared photos of herself with her kids and wrote, "Being a mom is my greatest joy and happiness ... my biggest challenge and my greatest triumph #HappyMothersDay to all!" (Photo: Jennifer Lopez/Instagram)

Orlando Bloom shared a happy Boomerang featuring Katy Perry with a sweet message for his fans. It read, "happy days to all the mums out there and to my marvelous mamma to be️" (Photo: Orlando Bloom/Instagram)

"Happy Mother's Day to our moms! Perfect grandmothers!," John Legend wrote along with the picture. (Photo: John Legend/Instagram)

Justin Bieber said he "can’t express enough the gratitude for all of the things you sacrificed for me! You always believed in me! I love you mom! Thank you! HAPPY MOTHERS DAY TO ALL HERO MOTHERS ACROSS THE WORLD TODAY." (Photo: Justin Bieber/Instagram)

Miley Cyrus shared a video and thanked her mother. She captioned the video, "Mothers Daughter for life! @tishcyrus Most supportive mommy ever ! You always told me I would make it , so I did it! So thankful for you always! Love you!" (Photo: Miley Cyrus/Instagram)

Selena Gomez shared a cute picture of herself with her mother and wrote, "I love this woman more than anyone could ever know.. happy mommas day!" (Photo: Selena Gomez/Instagram)

Kourtney Kardashian shared this adorable photo featuring herself and mom Kris Jenner. (Photo: Kourtney Kardashian/Instagram)