Denise Richards has undergone a total transformation. The Real Housewives of Beverly Hills alum, 53, took to Instagram on Monday, April 15, to show off her new brunette locks after rocking her signature blonde hair for decades. “Who do you think had the best performance so far? Weekend one is almost done! #coachella2024 🎶” Richards captioned the snaps of herself posing in a neon yellow tank and a pair of overalls. “Your hair color looks amazing!” one fan wrote in the comments section of the post. “What a change! love it!” a second social media user penned. “That hair color so gorgeous,” anothe…