Misty May-Treanor, the three-time beach volleyball gold medalist, has long suffered with severe nasal allergies which have impacted her training and performance. May-Treanor, a paid spokesperson for Teva Respiratory, is working with the AAFA on the <a href="http://www.ditchthedrip.com/" target="external">Ditch the Drip campaign</a>, which encourages nasal allergy suffers to manage the condition.

According to People Magazine, Kate Middleton is allergic to horses, but the Duchess of Cambridge said her symptoms have eased as she spends more time with them.

Scarlett Johansson once said in a "20 Questions" article, "I'm extremely allergic to the outdoors. Grass, trees, weeds."

Britney Spears may like the birds, but certainly not the bees. The pop singer is allergic to bee stings.

Marie Osmond blamed bad air quality after she fainted on Dancing With the Stars in 2007. Osmond is reportedly allergic to smog.

Debra Messing is reportedly allergic to many types of flowers. She chose long-stemmed calla lilies on her wedding day to avoid being a blushing and watery-eyed bride.

Before a show at Meadowlands Stadium in his home state of New Jersey, Jon Bon Jovi told The Record newspaper, "I worry about dumb stuff like allergies … like going out there and sneezing. I never worry about singing or playing or the band's performance, the production or anything like that. I'm more into, 'Can I breathe tonight?'"

Spring-cleaning may leave Hilary Duff a bit sneezy and wheezy. The "Come Clean" singer is reportedly allergic to pollen.

Orlando Bloom reportedly suffers from allergy rhinitis, also known as hay fever. The term is used to describe a collection of symptoms, mostly in the nose and eyes, that occur after breathing in pollen, dust or dander.

Garlic, bees, coffee and perfume are all on Drew Barrymore's list of things to avoid, according to her IMDB profile.

Rashida Jones' allergy to cats is so severe that she has reportedly had to delay scenes if cats are around.

Paula Abdul has an allergic reaction when exposed to cats or dust.

Tori Spelling, the author of "sTORI Telling," is allergic to cats. On her website, she writes, "I'm allergic to cats, but I had three of them for years because they're super-cute and I work with rescue animals."

Tiger Woods pushes through golf tournaments while fighting off his pollen allergy.

Cameron Diaz also seeks respite from some flowers. The "Bad Teacher" actress reportedly uses a neti pot to relieve her allergy symptoms.

Even though she's launched her own fragrance line, Beyonce is allergic to most perfumes. Her own line has reportedly been chemically altered to ensure Ms. Knowles does not have an allergic reaction.