I've been listening to this song and jamming along with it. I didn't find any tabs 
so i'm going to post the one i use! may not be 100% correct because it's my interpretation!

0:14
When Cee-Lo starts singing play this:

"Well hello is this thing on..."
G|--------------|-------------|-------------|------------|
D|---------22---|--------22---|3-33----22---|------------|
A|-3-33-030---3-|5-55-030---3-|-----030---3-|333~--------|
E|--------------|-------------|-------------|------------|

0:55
Occasionally (usually after the chorus) there's a slide:

"So i can feel something new..."

G|--------------|-------------|-------------|------------|
D|---------22---|--------22---|3-33----22---|------------|
A|-3-33-030---3-|5-55-030---3-|-----030---3-|------------|
E|--------------|-------------|-------------|-8/0--------|

3:19
When they start singing:

"Open up, Open up, Open up some happiness..."

Play this:

G|-----------------|----------------|---------------|------------|
D|-----------------|----------------|3-3-3-3-3-3-3-3|------------|
A|-3-3-3-3-3-3-3-3-|5-5-5-5-5-5-5-5-|---------------|333~--------|
E|-----------------|----------------|---------------|------------|

Thanks for viewing, NiHiLiSTS CReeD