“WILL & GRACE” STAR Debra Messing has hired a team of fitness experts to make sure her pregnancy is no pain AND no gain.

The 35-year-old actress, who’s due this summer, has a trainer, a physical therapist and a nutritionist working to ensure that she eats all the right foods and gains enough weight to have a healthy baby . . . but not too much more.

“This pregnancy is the biggest thing in her life and she wants every aspect to be perfect,” a source told The ENQUIRER.

Parenthood has been a long time coming for Debra and actor/ writer husband Daniel Zelman, 36.

They dated eight years before tying the knot in September 2000.

“So she isn’t taking any chances,” says the source. “Debra found a nutritionist who specializes in pregnancy and had her make up a special diet.

“Debra had a very serious gastro-intestinal surgery two years ago and is very conscious of what she eats.

“On top of that, she’s got her own trainer, plus a physical therapist on call to keep her strong and limber for the childbirth.”

All the attention seems to be paying off, adds the source.

“Debra is absolutely glowing from this pregnancy.” — JIM NELSON and TIM PLANT