Gadot responded by sending River a special surprise.
Clarkson tweeted a photo of herself and River holding two Wonder Woman figurines, along with an autographed photo of Gadot in full costume. It's inscribed, "Dearest River Rose, I wish you all the best. Your mom is the true Wonder Woman!"
"THANK YOU SO MUCH @gal_gadot for the awesome presents for River!!" Clarkson wrote. "She LOVES them! You’ve made a little girl very happy!"
As People reported earlier this year, Clarkson gushed over Gadot at Variety's Power of Women event. The magazine noted that Clarkson told the crowd that Gadot made her "so nervous I'm shaking," and added, "[My daughter] loves Wonder Woman."
"She’s 3. I probably shouldn’t show it to her. I know I’m being judged, [but] all the grown-up stuff goes over her head,” Clarkson said at the time. “It’s nice to have this bold, female figure for your girl.”
“Once she saw the little girl in 'Woman Woman' defend herself and all that she loved, she started acting it out, and I couldn’t have been more proud,” she added.