The assistant appeared stunned by the pricey gift, in video obtained by TMZ.
After a birthday meal, the 20-year-old singer handed her assistant an empty bag before pulling out a key fob from her pocket.
Madison then took her personal assistant round the corner to show her a brand new Mercedes-Benz C300.
According to the gossip site, it was her PA’s dream to own a Mercedes and Madison gifted it to her because she knew she was having trouble with her existing 12-year-old car.
The vehicle is valued at nearly $50,000.

