The beauty drew comments from internet critics and bloggers as she interviewed stars including Zac Efron and Gabourey Sidibe during a pre-Oscars special on U.S. TV, with many viewers questioning her sobriety.
But the mum-of-three has assured fans her strange behaviour was simply due to the fact she was delighted to be on the red carpet.
In a series of posts on her Twitter.com page, Ireland writes: "(I) cannot please everyone... and frankly I wouldn't ever want to. Don't feel embarrassed for me. Had a blast and it was so much FUN!
"No meds (medication) or alcohol... just J.O.Y.! Never use drugs and that as a Mom is not a cool or funny suggestion (sic)... Some say I looked pregnant. LOL (laugh out loud)! Not true... others say I was drinking... Just excited to be involved. Grateful."