The 25-year-old singer ditched her signature long ponytail for a shorter do when the siblings enjoyed a spot of sushi in Studio City, Los Angeles.
The Thank U, Next hitmaker had her dark tresses styled in a centre parting and worn down for the occasion.
Ariana kept her look very feminine as she wore a pale pink jumped, burgundy jacket and nude over-the-knee heels.
During the brother and sister's dinner, Frankie was spotted putting his arm around his little sister.
However, this is not the first time Ariana has experimented with a new look.
Earlier this month the beauty took to social media to show off a sleek bob.
Ariana's fans flocked to praise her for the new style.
One wrote: "This hairstyle looks so cute, pretty and gorgeous on you."
Another wrote: "You are beautiful Ariana", a third added: "Looove the hair."
Meanwhile, Ariana has had a turbulent few months.
The star enjoyed a whirlwind romance with former fiance Pete Davidson, which came to an end in October.
The former couple started dating in May 2018, and just months later confirmed their engagement.
But one month before Ariana and Pete split, the powerhouse's ex-boyfriend, Mac Miller, tragically passed away.
The Sun Online understands that Ariana called off her engagement with Pete because the pair were rowing over Pete's 'lack of support' following Mac's death.
A source close to the star previously said: "Ariana dumped Pete. They'd been rowing for two weeks about Pete's lack of support after Mac's death. Ariana has been devastated and Pete couldn't handle it. She realised she needs a grown-up who can support her and that's not him"
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