The 36-year-old singer took to Instagram on Monday to share a pic from her morning workout session, where she was seen posing in a split mid-headstand.
"Monday morning #yoga ! Never stop stretching and challenging yourself. First headstand!" she captioned the impressive snapshot.
Sporting a black sports bra and matching leggings, the former Pussycat Dolls star proved that she's still been working hard on those rock-hard abs and toned legs.
While the brunette bombshell seems to have mastered yoga, she likes to mix up her workouts to get the best results.
"In a typical workout I would run on the treadmill maybe 20 mins, then try to do some squats, some sit-ups on the exercise ball, some yoga stretches," she told Women's Health U.K. last year. "When I'm home I like to take a spinning class called Soul Cycle or I like to do hot yoga - a modified version of bikram yoga - or hiking, and core power yoga in LA."
Nicole also follows a few simple rules to maintain her health. "Love and accept yourself. Get lots of sleep - sleep really makes such a huge difference," she explained. "Drink lots of water. Don't deprive yourself of anything because eventually you'll crave it and then you might binge on it. Everything in moderation."
Even though this pop star is all about moderation, she does let herself indulge once in a while. "When I'm going to indulge, I love pasta, pizza, I love Mexican with lots of cheese," she revealed. "I love French fries, or crisps - salt and vinegar crisps. In terms of snacks: almonds, coconut water, bits of coconut, baby carrots."