Paris Hilton celebrated Sia’s birthday in the most liveliest way possible.
The 42-year-old actress and singer wished 'one of her most treasured friends' at the late hour on Monday, December 18.
She posted an adorable video, featuring a montage of short clips from their outings, events and concert performance.
Along with the cute video compilation, the Lone Wolves crooner penned a sweet birthday message for Sia, who just turned 48.
Hilton began, "Happy Birthday to one of my most treasured friends @SiaMusic! [emojis]".
Before hinting to their upcoming projects together, set to release the following year, the Come Alive songstress continued, "So incredibly grateful to have you in my life and with me on this music journey."
She concluded the caption, "Thank you for always inspiring me and supporting me[emoji] I Love you to the moon and back! [emojis]".
Hilton, previously made an announcement on Jimmy Fallon’s The Tonight Show, regarding her new album, executive produced by none other than Sia.
The revelation comes after the TV personality affirmed to the host, "Yeah , I am recording the new album right now."
The Stars Are Blind singer finally started working on the long awaited follow-up to her 2006 debut album, Paris.
At the time when she made her collaboration with Sia public, she was working with Steve Aoki to release her single, Lighter.
The song is part of superstar DJ’s 10th studio album, Hiroquest: Double Helix which came out on November 17.