Katie Holmes's weight loss worries friends

Since giving birth to her daughter Suri, Katie Holmes has been undercover. The actress used to be spotted nearly every day either shopping or going to one of Connor or Isabella’s - Tom Cruise’s kids - soccer games. But lately Katie Holmes sightings are about as regular as Bigfoot sightings. Where has the actress disappeared to?

According to the Toronto Fashion Monitor, Katie has been spending all of her time since giving birth getting back into shape. In fact, Holmes has lost 28 pounds and gone down two dress sizes in the weeks since Suri was born. Her rapid weight loss has reportedly worried her close friends.

Katie’s body transformation has come as a result of her training with Sue Fleming of Buff Brides. A source close to the actress to Britain’s Daily Star, "Katie has embarked on a hardcore fitness regime and does 200 sit-ups a day, combined with two hours of cardio work before pilates." An insider at Contact Music added, "Her weight is just rapidly falling off. It can't be good and has got to be very stressful."