Kelly Clarkson brought out an exciting new star to her Vegas residency … but, tickets for her tour won’t be coming out anytime soon — ’cause she’s still got to get through middle school.

The singer-songwriter took the stage at her “Studio Session” residency at Caesars Palace’s Colosseum … and, she told the crowd she had a special guest to serenade them.

Her 11-year-old daughter, River Rose, came out … and, together, they belted out Clarkson’s “Heartbeat Song.”

Check out the clip … the Kelly’s leaning in close to help her little girl harmonize with her — and, River puts in a really strong performance for someone so young.

As for how the audience reacted … they seemed really positive — whooping it up while the two performed together.

It’s good to see Kelly back onstage … ’cause she had to cancel a couple shows earlier this month after rehearsals took a toll on her voice and made it impossible for her to put on a good show for her fans.