Frankie Grande Shares Sweet National Siblings Day Tribute to the 'Best Sister in the World' Ariana Grande

The actor/dancer took a moment to share how grateful he is for his pop superstar sister on National Siblings Day on Wednesday, April 10

Frankie and Ariana Grande's sibling relationship is nothing short of "eternal sunshine."

In honor of National Siblings Day on Wednesday, April 10, Frankie, 41, shared a moving tribute to his pop superstar sister Ariana, 30. The Broadway star took to Instagram to post a sweet selfie of himself and the hitmaker, and opened up in the caption about how appreciative he is of his little sis "for being there for [him] through thick and thin."

The two posed next to one another in the wholesome shot, with Frankie flashing a big smile and Ariana glancing over at him as she pursed her lips. The TV personality wore a mauve sweater and chain, while the Grammy winner was dressed in a black turtle neck and delicate hoop earrings.

Related: Ariana Grande's Family: All About the Singer's Parents and Brother Frankie Grande

In the caption, Frankie wrote, "On #NationalSiblingDay, I want to take a moment to thank the BEST sister in the world for being there for me through thick and thin."

Specifically, the former reality TV star opened up about how supportive the "yes, and?" singer has been of him being nearly seven years sober. Frankie added, "From helping me with my sobriety journey to showing up for me at big moments in my life and career."

"You are the best sister anyone could ask for and I’m eternally proud of you and all the sunshine you continue to spread in this world 🫧💕," the theater actor concluded, making thoughtful nods to Ariana's latest album eternal sunshine.

The "we can't be friends" singer expressed how much her brother's message meant to her in the comments. "my sweetest! i love you so so much 🥹🥹🥹," she responded.

A handful of their friends also commented sweet replies. Drag star Shangela added a simple "❤️," and Broadway star/musician Sean Bradford wrote, "wowowow my favorite sibling pair looking immaculate."

Related: Ariana Grande Says Releasing Eternal Sunshine Has Reopened 'Little and Big Feelings': 'It Has Been an Emotional Week'

Frankie and Ariana have long been very close with one another and supportive of each other's careers.

Last October, the Wicked star stepped out to see her brother in the starring role of Dr. Frank-N-Furter at the Bucks County Playhouse's production of The Rocky Horror Picture Show in New Hope, Pennsylvania. After the performance, she continued to spend time with the YouTuber and they shared fun photos on Instagram of their early Halloween celebrations together.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories.

On Christmas, Frankie also posted spirited photos of the sibling duo, as well as their mom Joan, enjoying the holiday together.

The former Big Brother contestant more recently gave Ariana a heartfelt shout-out upon the release of her seventh studio album, which dropped on March 8.

Following Ariana's appearance on Saturday Night Live, Frankie posted a shot on Instagram featuring himself, his husband Hale Grande, Ariana and their mother, 66, and shared in the caption how proud he is of his younger sister.

After noting the album's feats, like its No. 1 debut on the Billboard 200, he said, "you have continued to show the world your growth as an artist."

"I say this a lot when I write these messages about you and your work but it is true, you continue to make me prouder and prouder,' Frankie wrote. "But despite all your accomplishments, this week and forever, it is your heart that continues to shine brightest. And that makes me proudest. I love you so much."

Related: Here Are the Most Revealing Lyrics About Ariana Grande's Relationship with Ethan Slater on New Album Eternal Sunshine

Last October, Frankie opened up to PEOPLE about how close he's gotten with Ariana over the years, especially since she stood by him amid his sober journey.

“I guess, as you grow, you grow closer together," he said. "And I think also, my own journey in my own personal life, with sobriety."

"I think as I've grown sober, and more sober, we've grown even closer," the performer continued. "And our relationship is even stronger than I think it's ever been in our lives."

Frankie added, “Going through something like that can really change a relationship, and in this case, it was for the much, much, much better and stronger."

For more People news, make sure to sign up for our newsletter!

Read the original article on People.