In her Instagram post on October 1, Shaina revealed that Piolo gave her a bouquet of red roses that night.
Shaina showed a picture of the roses and tagged Piolo, whom she called "#myconstant."
She described Piolo as one of her "genuine friends" who has chosen to "stay" in her life through thick and thin.
Shaina's full caption reads: "...to constant...ly magical celebrations!
"Heart is full of gratitude to be blessed with genuine friends around me especially during showbiz events like the ball.
"These souls who make such evenings more beautiful and meaningful.
"Also, for choosing to realign with wherever I'm at now in my life, and for choosing to stay...
"Grateful for all of your presence #mostesptoyoumyperennial.
"Guess you're really #myconstant as well."
In an interview with PEP.ph on September 24, Piolo explained that he didn't ask Shaina to be his date to the Ball to avoid any intrigue.
"Bina-bash kasi ako 'pag nagsasalita ako about Shai, eh. So ayoko na lang magsalita. Bahala na.
"Ang dami kong nakukuha sa Instagram. Baka pumatol ako, kaya ako na lang magsalita."
Piolo hinted that he has a personal "tradition" at the annual ball, but did not elaborate if it has something to do with Shaina.
Smiling, he added, "Gulatan na lang."
Piolo and Shaina have been rumored to be dating on and off for the past years.
In February 2017, Piolo told PEP.ph that he and Shaina have been "exclusively dating" for five years.
Shaina clarified, however, that she and Piolo are not officially together and that they are still free to date other people.
Shaina added, "But I appreciate how he has been consistent that he's not seeing anyone else but me."