Jennifer Lopez reveals her promise to her step daughter

Jennifer Lopez has a very sweet relationship between her and fiancé Alex Rodriguez's daughters Natasha, 15, and Ella, 12. 

Last week, Ella turned 12, and J-Lo opened up about their close bond as she wished the pre-teen a happy birthday.

 Jennifer Lopez revealed that she had promised Ella her Ralph & Russo lilac dress, which she wore to the 2017 Grammy's. 

The gorgeous design features a ruffled neckline and high slit, and Ella has had her eye on it ever since! On the first time they met, J-Lo penned: "You ran to me, sat right on my lap, put your arms around me and asked to have my lavender dress I had just worn to the Grammy's for when you grew up. You won my heart in a split second."

See the dress.... 

Jennifer has saved the dress for her, as well as many other gowns to split between the star's daughter Emme, 12, and Ella's older sister Natasha, 15. 

The dancer previously told Entertainment Tonight that the girls often discuss which outfits they want to have when they are older. "Ella told me: 'I want your [Grammy's] dress with the orchid,' and Emme is like: 'What about that [dress], mummy? Are we going to keep that? Don't throw that out.' They tell me all the time," she said.