Frankie Grande caused an uproar in the Twitterverse when a comment he made about his sister fuelled rumours that Ariana Grande was dating Social House’s Mikey Foster.

Us Weekly caught up with the former “Big Brother” houseguest at a recent event, where he gushed about he and his boyfriend having gone on a “double date” with his sister and Foster.

“It was really fun,” he told the magazine. “Game night! Board games! So fun.”

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It didn’t take long for headlines to declare that the “God Is a Woman” singer was dating Foster, and Grande quickly put a halt to the rumours.

On Thursday, he issued a declaration on Twitter.

“My sister is not in a relationship. Everyone relax,” he wrote in the now-deleted tweet. “She is very much single.”

The 26-year-old singer hasn’t been romantically linked with anyone since her whirlwind engagement to “Saturday Night Live” star Pete Davidson ended late last year.

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Ariana Grande’s Whirlwind Year