You know how you like to play dress-up with your best friends and do each other's makeup and hair? Well, these celebrities and their professional glam squads  are tight just like that. These men and women travel the world doing makeup and hair for the stars (who also happen to be their biggest fans). You may never see them walk the red carpet, but these behind-the-scenes beauty rock stars are known for their work. From Jennifer Aniston  to Jessica Alba , meet the BFFs of the celebrity beauty world.
Nicole Richie and Andy Lecompte
Nicole and Andy are the type of best friends we strive to be! Not only is he the man responsible for her lob haircut, but they also have a relationship that extends outside the salon. He's even made a guest appearance on her YouTube series , Candidly Nicole.
Jennifer Aniston and Chris McMillan
Every iconic hairstyle Jennifer Aniston  has had since the Rachel has been the creation of Chris McMillan (including her bob haircut ). The two have been best buds since Jennifer's days on Friends, and they're still going strong through thick and thin.
Lily Collins and Kayleen McAdams
Makeup artist Kayleen McAdams may be Rachel McAdams 's sister, but her top client (nepotism aside) is Lily Collins. The young actress is pretty new to the scene, but Kayleen has been getting her ready for red carpets since her college days, when Lily used to write for magazines like Cosmo.
Rihanna and Ursula Stephen
Rihanna  changes up her hair so often we can barely keep count. Which means that her friend and stylist Ursula Stephen stays busy. From blond to red to jet black, Ursula has helped Rihanna mold her most enviable styles . The two may bump heads from time to time, but that's what best friends do!
The Olsen Twins and Mark Townsend
Mary-Kate and Ashley Olsen  have the type of textured, beachy hair women lust after. Every time a gal walks into the salon with one of the Olsens' photos, she is giving credit to Mark Townsend. The trio have such a long-standing relationship that Townsend feels comfortable breaking their hair rules. Mary-Kate only likes a few bobby pins in her styles, but he sneaks in extras from time to time.
Rachel Zoe and Joey Maalouf
We first discovered Rachel Zoe and Joey Maalouf's relationship on her show, The Rachel Zoe Project. Maalouf even dressed up as Rachel for Halloween  (bangs and hat included). His makeup skills have also been featured on Rachel's website . They're one duo who prove that you can mix business and pleasure.
Gisele Bündchen and Harry Josh
We envy Harry Josh's eyebrows almost as much as we want Gisele Bündchen's honey-highlighted mane. The two have been together for such a long time that it's no surprise they share a tight relationship off set, too. Gisele even took the time to promo Harry Josh's pro tools line on her Instagram! That's the support of a true friend.
Lupita Nyong'o and Ted Gibson
Lupita Nyong'o wowed us with her red-carpet style this past awards season, and she has already locked in her mane man — Ted Gibson. She has trusted him to create a number of magazine and red carpet looks including her high-top SAGs Afro . We sense this is the beginning of a long-term relationship.
Jessica Alba and Lauren Andersen
Jessica Alba  and Lauren Anderson are more like buddies than co-workers. In a recent feature for The Hollywood Reporter , Andersen talked about how they met at 14 and have been working together ever since. She was the makeup artist responsible for Alba's amazing orange lip at the 2013 Golden Globes .
Cameron Diaz and Gucci Westman
Makeup artist Gucci Westman counts many famous women among her clients including Kate Hudson , Jennifer Aniston , and Gwyneth Paltrow . But actress Cameron Diaz  is the one she counts among her best friends. Cameron even served as a bridesmaid in Gucci's wedding .