However the former Peepshow star appears to have sprung back to her pre-pregnancy shape as she took in an energetic morning run in Las Vegas on Saturday.
Holly was sweating off the pounds with a smile as she bounced along the neighbourhood street amidst trees and green foliage.
Her scanty attire did little cover that hourglass form, exposing plenty of cleavage, stomach and legs. Adding a fashionable flair were Holly's turquoise-blue and pink trainers. She ran alone but had a handy iPod plugged into her ear to keep her entertained and motivated.
The new mother wore her blonde hair pulled back in a ponytail during most of her heart-pumping routine, but during her stretching portion allowed it fall out of its clasp and around her shoulders.
Holly eventually slowed down to extend those muscles in a few relaxing stretches.
The former star of The Girls Next Door - and one-time favourite gal pal of Playboy mogul Hugh Hefner - delivered a healthy daughter named Rainbow, with fiance Pasquale Rotella, on March 5.
Throughout her pregnancy Holly stuck to a healthy diet and exercise regime.
After Rainbow was born, Holly consumed 1,100 calories a day to help shed the excess 40 lbs gained during those nine months of pregnancy.
The frequent guest to nightclub openings and other Sin City events does admit to a few tricks of the trade when it comes to looking red carpet-ready.
'How do I hide my leftover preggo belly for the red carpet? Combine all my favourite slimming tips: a high waist, a flared skirt and a wide belt,' Holly has said.
She also revealed that a gym workout before a party and wearing a corset also help.
A pretty coral frock she wore to the PRiSM bash on May 31 complimented Holly's curves while disguising the bulges.
All joking aside she really does look great and she's always wanted to be a mom so I can't help but be happy for her.