How to say "Hemp Gru is the best"?

I want to print it on my T-shirt.
Is "Hemp Gru jest najlepszy." correct?
Or is there some other saying that can express the same meaning?
Dziękuję.

Kids today say "debeściak" (de = the, beściak << best), Although it may be out of use in a few years time, but so will be your T-shirt, I guess?
"Hemp Gru jest debeściak"
or "Hemp Gru to debeściaki"

(in the future, if you need a female form, the noun is "debeściara", plural "debeściary")

Thank you soooooooooooooooo much Krzysztof!

Don't use "debeściak". It's lame :)
Write "Hemp Gru rządzi" It means: Hemp Gru rules. Or "Hemp Gru wymiata" means Hemp Gru rocks.
I also like some Hemp Gru songs. Especially "życie warszawy". The video clip of życie warszawy is cool. It's kind of amateur, but it has the climate.

I guess I shouldn't express any more advices on street talk then, I'd rather thought that "Hemp Gru rządzi" is lame (in Polish), but I definitely don't have a feel for this kind of speech :)
Sorry, sjf, if you already wasted a T-shirt :(

Thank u all!
I haven't printed it yet. So don't say sorry^_^.

Krzysztof: Every T-shirt with this kind of sentence is lame :)