Reese Witherspoon is staying active even in the late stages of her pregnancy.

The actress is currently expecting her third child - her first with second husband Jim Toth.

Thought to be due this month, insiders have revealed that Reese is feeling great thanks to a sensible but active fitness and diet regime.

"Reese hasn't gained much weight. She's been on a nutrition plan and has been hiking and doing yoga," a source told British magazine Closer.

According to family friends, the blonde beauty is excited to welcome a sibling for her two children - Ava, 12, and Deacon, eight with ex-husband Ryan Phillippe.

The 36-year-old has been pictured looking glowing, happy and relaxed as she ventured out in Los Angeles this week.

Despite being close to giving birth, Reese has reportedly been lending a helping hand to former co-star and friend Robert Pattinson.

The Water for Elephants actress has let the star stay on her ranch in Ojai, California, following the news of his girlfriend Kristen Stewart's infidelity.