Italian singer Pausini told the BBC’s Carl Nasman that she’s “very excited” and “proud” to be performing alongside Williams and Scherzinger at the closing ceremony.
“When Robbie [Williams] invited me to sing with him, I felt goosebumps everywhere because Robbie’s one of my favorite singer, songwriter, and performer,” Pausini told the BBC.
The planned celebrity performances will also include a half-time show headlined by Madonna, Justin Bieber, Shakira and BTS.
Madonna, the best-selling female music artist of all time, will perform after the launch of her new album, Confessions II, which debuted as the Number 1 album on the Billboard 200 chart in July.
Justin Bieber also returned to headlines in April with his biggest live show in four years at the Coachella music festival, having cancelled his Justice world tour following health issues.
Colombian pop star Shakira and Nigerian musician Burna Boy will return to the stage together after performing during the opening ceremony in Mexico City last month.
Their song Dai Dai has been a global favourite on music charts and was a frequently played number at stadiums during the tournament.
Meanwhile, K-Pop stars BTS will perform after making their comeback from a three-year music hiatus to complete their mandatory military service in South Korea. They are currently in the middle of an 85-date world tour.
The half-time break is expected to last 20-25 minutes, with Fifa saying the Super-Bowl-style performance will take 11 minutes.
It has been curated by Coldplay’s Chris Martin and will raise money for the Fifa Global Citizen Education Fund, an initiative working to raise $100m (£73m) for children worldwide.