So that's how she does it! Reese Witherspoon fits in early morning gym trip before heading out looking her best

PUBLISHED: 23:59 EST, 14 March 2013 | UPDATED: 04:22 EST, 15 March 2013

She looks almost back to her pre-baby best.

But Reese Witherspoon works hard to look this good.

The actress was a breath of fresh air as she ran errands in Los Angeles on Thursday, wearing a pretty floral blouse and jeans that fit every curve of her figure.

Sweat for success: Reese Witherspoon put in a grueling workout at the gym and later was dressed to conquer in a floral blouse in skinny jeans

Earlier in the day, the 36-year-old This Means War star put in a grueling workout at the gym, proving that exercise is a must even for A-listers.

Reese was virtually unrecognisable in her black sweat trousers and matching sweat shirt and hood that covered her whole head, along with neon green and blue-laced trainers.

That wide grin wa perhaps the one clue that gave her away.

Cover up: Reese didn't look too glamorous and tried to conceal her identity underneath her hood and behind dark shades

Reese couldn't help but smile after sweating through another invigorating workout, no doubt feeling that she could conquer anything.

Later she was spotted walking down a street in her Brentwood neighbourhood looking gorgeous in skinny jeans along with that hard-to-miss button-down blouse scattered with large pink flowers.

She also carried a fushcia-pink handbag that lent a chic touch and pointy heels to match.

Breath of fresh air: Reese dressed up her outfit with a fuchsia handbag and matching pointy heels

She wore her light blonde hair loose and straight with feathered ends.

When the afternoon got chilly, Reese pulled on a navy jumper that gave her outfit a preppy perk.

The mother-of-three puts in several sessions at the gym a week where she does yoga and Pilates.

Reese, who gave birth to her third child, Tennessee James, in September, seems to have worked back to her pre-baby figure.

For a busy actress such as Reese, staying fit is important.

Reese has two films in pre-production including Wish List, about how life changes for a thirtysomething career woman after she throws a coin into a magical fountain, and the romantic comedy Men Are From Mars, Women Are From Venus.