They've known each other since Kim Kardashian 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 Hollywood, California.
Metallics: Paris Hilton gave Kim Kardashian 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
Giving it their best: Both ladies still looked in great shape even though they are nearing 40
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
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
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
