Do i think we are being watched by Aliens right now? No
Do i think Aliens exist? Yes
Are they strange green creatures with big heads and long ears? Who knows?
I think it would be ignorant and arrogant of the human race to believe that we are the only intelligent living creatures in the universe, by law of averages you have to say that there are many other planets similar to ours not yet discovered or visible (possibly due to there distance away and there light hasn't actually reached us yet from the big bang?)