Cabello will open for the "That's What I Like" singer during the tour's North American leg, with dates running July 20 to August 22.
The 20-year-old star made the announcement in a string of emotional Twitter messages, writing that she's "geeked" to be opening for Mars -- "every night I'm gonna be peering out from side stage trying to learn as much as I can," she added.
Since Fifth Harmony announced Cabello's departure in late 2016, the star has released two songs from her highly anticipated solo album: "Crying in the Club" and "I Have Questions." Her full debut album, The Hurting, The Healing, The Loving, drops in September.
But Cabello isn't the only female pop star joining Mars on the extensive world tour: Dua Lipa will pick up as the opening act in September, touring with Mars into 2018, the singer announced Monday on Twitter.
Until then, check out the full list of Cabello's opening performances on the 24K Magic World Tour below.
Bruno Mars 24K Magic World Tour Dates With Camila Cabello
July 20 -- San Jose, CA @ SAP Center
July 21 -- San Jose, CA @ SAP Center
July 23 -- Portland, OR @ Moda Center
July 24 -- Tacoma, WA @ Tacoma Dome
July 26 -- Vancouver, BC @ Rogers Arena
July 27 -- Vancouver, BC @ Rogers Arena
July 30 -- Edmonton, AB @ Rogers Place
July 31 -- Edmonton, AB @ Rogers Place
August 2 -- Winnipeg, MB @ MTS Centre
August 4 -- Fargo, ND @ Fargo Dome
August 5 -- St. Paul, MN @ Xcel Energy Center
August 7 -- Lincoln, NE @ Pinnacle Bank Arena
August 9 -- Kansas City, MO @ Sprint Center
August 12 -- Detroit, MI @ Palace of Auburn Hills
August 13 -- Indianapolis, IN @ Bankers Life Fieldhouse
August 15 -- Cleveland, OH @ Quicken Loans Arena
August 16 -- Chicago, IL @ United Center
August 18 -- Chicago, IL @ United Center
August 19 -- Chicago, IL @ United Center
August 22 -- Pittsburgh, PA @ PPG Paints Arena