.

A more classy alternative!

hasło reklamowe Micro$oftu, zmienione po zamachach 9/11 na "yes you can" :)

Of course, one could go as far as a literal translation:

Let our souls indulge, hell does not exist!

Or, in a more poetic way:

Hell is not - indulge yourself!

But, in everyday speech, either phrase would sound very dry and artificial. Thus, my suggestion: forget it (that you may end up in hell), let's party (bawmy sie, hulajmy)!
The "forget it" part of the phrase can be modified to better reflect the situational context. So, in the order of ascending "rudeness", it would look like this:

Forget it, let's party!
Heck with it, let's party!
Screw it, let's party!
Fuck it, let's party!

Eventually, it should be up the Asker to choose a variation that best fits the circumstances. Good luck!