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.
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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.