Is it Irony? No, it's just sad, a lack of willpower.
Is breaking a New Years resolution ironic? No, it's Bound to Happen.
The anti-rehab hit “Rehab” is itself up for top Song and Record honors and would be what she performs for a worldwide audience – creating both an irony and an embarrassment. While the Recording Academy supports free expression it also avidly battles drug addiction through its highly regarded, and donation supported, Musicares program. It’s like the Firemen giving a Citizenship award to an arsonist.
This metaphor is completely wrong. I would say it's more like the Firemen giving an award to a man for singlehandedly protecting his town from fire, and while he was at the award ceremony, his town burning down. Or, it's like the Firemen giving an award to a man who failed to stop a fire. Amy Winehouse isn't the enemy in the war against drug addiction, she is a fallen soldier.
Verdict: Not ironic.