AceShowbiz - Blake Lively has regretted poking fun at Kate Middleton's "Photoshop fail." After the latter came clean with her cancer diagnosis, the "Gossip Girl" alum publicly apologized to the royal through social media.

The 36-year-old expressed her remorse via Instagram Story on Friday, March 22. "I'm sure no one cares today but I feel like I have to acknowledge this," she penned. "I made a silly post around the 'photoshop fails' frenzy, and oh man, that post has me mortified today. I'm sorry. Sending love and well wishes to all, always."

Blake poked fun at Kate's Photoshop gaffe in a promo photo for her beverage products, Betty Buzz and Betty Booze drinks, which are launching in May. On the first slide of an Instagram post uploaded last week, she shared a heavily Photoshopped picture of her holding a can of Betty Booze.

In the image, the "A Simple Favor" star was sitting on a lounge chair next to a pool and smiling while giving a thumbs-up. The Photoshop fails were made obvious with her abnormally large thumb and a ring warped across a couple of her fingers.

The chair she sat in defied the laws of physics as it didn't seem to be connected and her body was distorted, with a disproportionate lemon falling from the sky above her. Her leg also looked disproportionately long.

"I'm so excited to share this new photo I just took today to announce our 4 new @bettybuzz & @bettybooze products!" so Blake wrote in the caption. She appeared to poke fun at the Princess of Wales' whereabouts as she added, "Now you know why I've been MIA."

Blake has since come under fire. "Mocking a sick woman in desperate need of privacy. Bravo!" one follower reacted to Blake's post," while another commented, "So sad you would make fun of Kate at this time-she went through major surgery! I am sure money is your God! Enjoy."