Cardi B's a tough act to follow ... according to Bruno Mars, who just announced he's replacing her spot on his tour with a slew of artists ... including Ciara.
Bruno played the role of hype man -- in a BIG way -- when he finally revealed who's stepping into Cardi's role on the 24K Magic Tour. In addition to Ciara, he's bringing Boyz II Men, Ella Mai ... as well as R&B legend Charlie Wilson (aka Uncle Charlie).
As you know, Cardi pulled out of her opening spot last month on Bruno's upcoming tour, saying it would be too much of a physical and emotional strain so soon after giving birth to Kulture.
The tour kicks off next month in Denver.
And Bruno ... maybe one less cup of coffee??