Bad Boy R&B singer Cassie will release her as-yet-untitled sophomore album on May 20, and she says although "I hate to use the words grown-up, I really, really did since the last time around."

"I guess I grew up a lot but I'm still in essence the same person," says the 21-year-old singer. "Lots has changed in my life, stuff that has made me think about things differently. I'm more vulnerable and you can hear my vocals better this time around. There's real emotion and a much realer connection with my fans."

The album features production from Seven, Mario Winans, Bryan Michael Cox, Eric Hudson, Sean C and LV and mentor Ryan Leslie, who discovered the Connecticut native. There are no guest features recorded as of yet.

And although a first single hasn't been released, Cassie assures it will be "a club record -- something fun and danceable." Possible contenders include the Seven-produced "My House," the flirty "Thirsty" and the concept track "Push It," on which Cassie sings, "Want you to light me up / keep me on my toes / gotta hold it steady."

Cassie released her self-titled debut in 2006, which went on to sell 319,000 copies in the United States, according to Nielsen Soundscan. Single "Me & U" peaked at No. 1 on Billboard's Hot R&B/Hip-Hop Songs chart and No. 3 on the Hot 100. It has also sold 989,000 digital downloads.