Leah Messer's Daughter Ali Stands on Her Own — And There's Photographic Proof!

To all the naysayers who didn't believe that Leah Messer Calvert's daughter would be able to walk on her own, we have only one thing to say to you: You were wrong!

Check out this picture of 3-year-old Aliannah chilling on her front porch, just barely holding on to a chair for support. Ali looks happy, healthy, and completely at ease as Leah snaps a picture to preserve the precious moment.

"My Beautiful Aliannah Hope," the Teen Mom star tweeted.

When Ali was just a baby, she was diagnosed with a mysterious developmental disorder, and doctors weren't sure if she'd ever be able to walk on her own. But Ali is making major strides — literally! — and even managing to keep up with her twin sister, Aleeah. Check out this video of Ali practically sprinting past her.

Leah and her hubby Jeremy must be so proud!