Former ‘Baywatch’ star Nicole Eggert has shaved her head amid her cancer battle. The 52-year-old actress – who is best known for playing Summer Quinn on the iconic lifeguard action-adventure series – was diagnosed with stage 2 cribriform carcinoma after finding a “throbbing” lump in her left breast, and later revealed doctors discovered more cancer in her lymph gland. After chopping her hair into a shorter style, Nicole got her daughter Keegan, 12, to help her as she shaved it all off. In a video documenting the process, which was soundtracked by Beastie Boys classic ‘(You Gotta) Fight for You…