Heather Locklear birthday was yesterday, and taking a good look at her, she does not look her age at all. It is a bit hard to believe that the "Spin City" star has just turned 53 years old a day ago.

Heather Locklear was spotted playing several rounds of tennis in Calabasas, California, looking amazingly young and gorgeous with only minimal make up. The famous "Melrose Place" star celebrated her birthday by showing off her slender and fit shape in a tennis game. She was wearing a tight tank top and very flattering spandex pants.

As soon as pictures of the fit birthday physique of Heather Locklear was posted on the Internet, fans are now curious on the routines or regimen that she uses in order to be fit and be able to keep it that way.

Heather Locklear informed Parade last January, "I do resistance training three times a week. That really helps with defying gravity and keeping things in place. I have light weights to do reps with both my arms and legs. I do cardio a couple times a week on the treadmill, with the music blasting. It's what gets me through."

It would seem that Heather Locklear is very much dedicated when it comes to her commitment to her workout routines. She said, "If I miss my workouts for a few weeks, it's harder when I go back. Keeping up with the healthy lifestyle makes it easier in the long run, especially cardio."

Apart from exercising regularly, Heather Locklear also loves to play sports. She added, "I also love to play golf and tennis. Even a walk in the evening can take the edge off a bad day."

She also revealed a few secrets about her diet. She said, "I use portion control and try to keep it healthy 80% of the time. I don't deny myself carbs or sweets. I just make every effort to keep it within reason. Sometimes when I'm tired after a long day's work, it seems like the easy thing to do. But, the next day, I regret it."