The couple, who split earlier this month (December 2018), was pictured laughing and joking as they rode on a jet ski in Puerto Rico on Friday, December 21, just hours before the "Bodak Yellow" rapper was due to perform at the Electric Holiday festival in San Juan on Saturday.
Offset was then spotted cheering Cardi on as she performed at the Puerto Rico Convention Center, according to a video published by TMZ.
And shortly after they were seen together, Offset took to Instagram to make a public declaration by quoting Michael Jackson's 1987 hit, "Man in the Mirror".
"I'm searching for the man in the mirror / I'm asking him to change his ways," the 27-year-old wrote alongside a photo of him dressed in a sequin jacket and sparkly headpiece inspired by the late King of Pop.
Both Offset and Cardi, 26, have been sharing videos from Puerto Rico on their respective Instagram Stories, though they did not mention nor feature each other in their footage.
"Goodbye Puerto Rico... what a amazing island with very f**kin good food (sic)!" Cardi wrote alongside a clip of the sea.
The rapper then jetted off to the Dominican Republic for her scheduled performance at the Electric Paradise Music & Arts Festival.
"When you drink 2 presidentes (beers)," she captioned a video on Instagram of her wearing a blue and green wig, while lip-syncing to a sexually explicit song. "I need to leave this country."
Meanwhile, Offset was back in the U.S. later on Saturday in order to celebrate his son Jordan's birthday.
The Migos star shared videos on his Instagram Stories as he took his eldest child - who he shares with ex-partner Justine Watson - to a paintball party.