flashes plenty of side boob as she makes cameo in Paris Hilton's ...

They've known each other since was her assistant. 

But it was original sex tape girl Paris Hilton asking for help this time, as she gave Kim a cameo in her latest music video on Thursday. 

The 38-year-old reality star took a break from her grueling legal studies to join the shoot in West , California. 

Metallics: Paris Hilton gave Kim Kardashian a cameo in her latest music video on Thursday

Metallics: Paris Hilton gave a cameo in her latest music video on Thursday

They go way, way back: The friends of 20 years were in step on the set

They go way, way back: The friends of 20 years were in step on the set

Giving it their best: Both ladies still looked in great shape even though they are nearing 40

Giving it their best: Both ladies still looked in great shape even though they are nearing 40

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Both Kim and Paris flashed plenty of side-boob as they shimmered in silver, whilst walking on set. 

Paris revealed the KUWTK star was making a cameo in the video on her Instagram. 

She captioned a picture, which gave a heavy clue as to the title: '#SecretProject with @KimKardashian. I can’t stop looking at my #BestFriendsAss.' 

Glam: Both Kim and Paris flashed plenty of side-boob as they shimmered in silver, whilst walking on set

Glam: Both Kim and Paris flashed plenty of side-boob as they shimmered in silver, whilst walking on set

Revealing: They looked gorgeous in silver

Revealing: They looked gorgeous in silver 

Paris had a black bra visible under her sparkly dress. 

She flashed plenty of leg, and sported towering black heels. 

Kim showcased her figure, as she went bra-less in the strappy mini-dress.  

Trailer: The 38-year-old reality star was on hand for the shoot in West Hollywood, California

Trailer: The 38-year-old reality star was on hand for the shoot in West , California

Leggy display: Kim was careful to watch her step as she walked down from her trailer

 Leggy display: Kim was careful to watch her step as she walked down from her trailer 

Sexy: Kim showcased her figure, as she went bra-less in the strappy mini-dress

 Sexy: Kim showcased her figure, as she went bra-less in the strappy mini-dress

Shapely: Paris flashed plenty of leg, and sported towering black heels

Shapely: Paris flashed plenty of leg, and sported towering black heels

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