Bruno Mars announces who's joining him on tour after Cardi B backs out

Bruno Mars speaks onstage during the 2018 Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018 in Las Vegas, Nevada. (Photo by Kevin Winter/Getty Images)

Cardi B may have backed out of the Bruno Mars tour, but he's found four other acts to hit the road with him.

Bruno announced on Instagram that Boyz II Men, Charlie Wilson, Ciara and Ella Mai will perform during his upcoming fall concerts on his 24K Magic World Tour.

Boyz II Men, who released their debut album in 1991 and launched multiple R&B and pop hits, will help Mars kick off the new shows on Sept. 7 in Denver. 

Then, Charlie Wilson taps in and will be at shows in Minnesotta and Michigan, including the two weekend shows Bruno has in Detroit. He'll be at Little Caesars Arena September 15 and 16. 

Cardi B, who is featured on Mars' "Finesse" remix, backed out of the tour last month, saying she wasn't ready to leave her newborn baby, Kulture.