"Baby, I'm Jealous" of everyone who went out to Los Angeles' hot club Deliliah Friday night ... 'cause they got a surprise performance from Bebe Rexha !

Check out our footage -- Bebe exudes confidence as she grabs a mic and belts out a variety of songs, including her 2015 hit "Me, Myself & I" with G-Eazy ... and even sang Rihanna 's "Bitch Better Have My Money"! Bobby Rachpoot

The bubblegum pink-haired beauty also performed "No Scrubs" and "I Wanna Dance with Somebody (Who Loves Me)" ... all in front of several celebrity guests including Kylie Jenner , Anastasia Karanikolaou , Gabriette , Bazzi , Victoria Villarreal and Suede Brooks .

She appeared to be having a blast as she showed off her vocal prowess ... and looked incredible while doing it, dressed in oversized

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