Katy Perry's Birthday: 12 Fun Facts You Didn't Know About The Pop Star

Katy Perry, one of the top-selling music artists the world over, turned 37 Monday.

Perry, the five-time American Music Award winner who was born in Santa Barbara, California, in 1984 under the name of Katheryn Elizabeth Hudson, grew up to become one of the renowned pop stars of America, achieving notable career milestones and earning over 125 million singles and a good 18 million albums to her credit since 1999.

The crooner rose to fame with the release of her second studio album called "One of The Boys" in 2008 and eventually became the proud recipient of several eminent music awards such as Billboard Music Award, Brit Award and Juno Award, among others.

Perry marked her spot in the pop music scene typically with fun lyrics and vibrant and playful sense of style. The Daisies crooner is currently engaged to English actor Orlando Bloom and the couple has a six-month-old daughter together, Daisy.

To mark Perry's birthday, below are some fun facts about her you probably didn't know:

• Perry is her mother's maiden name
• Perry has two siblings -- older sister Angela and younger brother Dan
• Perry cites Alanis Morrissette and the late Queen singer Freddy Mercury as her role models
• Perry is friends with Paul McCartney
• Both of Perry's parents worked as pastors. She started her singing career at her parents' church at the age of 9 where she sang until she was 17
• Perry is a gay activist. She reportedly voted against Prop 8, which was an amendment declaring that marriages can only happen between men and women.
• Perry was earlier married to British comedian Russell Brand. The couple married each other in 2010 in Rajasthan, India where they were vacationing at the time. However, their marriage didn't last long and they got divorced just 14 months later
• Perry carries locks of Taylor Swift and Miley Cyrus' hair in her purse
• She has 4 tattoos altogether. One on the left wrist, another on her left arm, one on each of her feet.
• Perry's favorite fitness activity is rope jumping
• Perry has written songs for Selena Gomez, Ashley Tisdale, and Kelly Clarkson
• Her hit number "I kissed a girl" was inspired by Scarlett Johansson