Pop star Ariana Grande is "disgusted" and "embarrassed" by her behavior after she was filmed licking doughnuts in a California bakery.

The Problem hitmaker caused shockwaves when she was caught on camera stating "I hate America" and mouthing a tray of delicacies in a Wolfee Donuts store in Lake Elsinore.

Earlier this week (beg06Jul15), she issued an apology to fans to explain her tirade was a comment on America's obesity crisis, and Grande has now taken to YouTube.com to say sorry to her followers for what she deems a "poor choice of words".

In the humbling video, entitled "Sorry babes", the singer also owns up to her bad behavior and vows to change.

She says, "I just want to make a video to apologize again for the whole doughnut fiasco and craziness because I feel like the apology I posted, I kind of missed my opportunity to actually sincerely apologize and express how I was feeling because I was too busy preaching about my feelings with the food industry, which is not relative... I feel I could have expressed myself in a different way... Seeing a video of yourself behaving poorly that you had no idea was taken is such a rude awakening (sic).

"I was so disgusted with myself. I shoved my face in a pillow and wanted to disappear, but instead of that I'm going to come forward, own up to what I did, take responsibility, and say I'm sorry... I reacted in a way that wasn't necessary to say the least and also wasn't me at all. I apologize for my poor choice of words and my behavior. Seeing how ugly it looks when you behave a certain way makes you never want to behave that way again."