Sam Smith performs during the second day of Lollapalooza Buenos Aires 2019 at Hipodromo de San Isidro on March 30, 2019 in Buenos Aires, Argentina.

Sam Smith is a huge international superstar, but that doesn't mean he doesn't get a bit fanboy sometimes too. The singer posted a pic on Tuesday morning (July 16) of a backstage moment he shared with Lizzo that made him feel like he was meeting music royalty.

"So truly happy I got to meet @lizzo the other day," he tweeted. "Her show was out of this world!! Made me feel so high on life!! She is the one. Can't wait to watch you continue to take over the world gorgeous."

So truly happy I got to meet @lizzo the other day. Her show was out of this world!! Made me feel so high on life!! She is the one. Can’t wait to watch you continue to take over the world gorgeous xx pic.twitter.com/waBOE9PHd3 — Sam Smith (@samsmith) July 16, 2019

Smith wasn't the only one who was blown away by Lizzo. Shania Twain also loved her performance over the weekend at the Montreaux Jazz Festival in Switzerland. "I had the best night watching these two phenomenal women at @MontreuxJazz -- @janellemonae @lizzo," Twain captioned a photo with the pair.

Smith recently teased the release of his upcoming single "How Do You Sleep?," due out on Friday (July 19), on which he promises to unleash his "inner dancing queen."