Horrible video, horrible song, Birthday is way better than this **** but if you see the comments everyone loved it and when someone point out that they copied her, everyone is like "nah, they are better than Katy" funny to see how people doesn't judge male artists like they do with female pop stars.
Yes. They also copied the single cover of Maps from Unconditionally.
Idk much about this. The floral pattern has been on trend for 2013 because of Tumblr and was used commonly in fashion lines like Zara and H&M.
I know Katy planned the whole floral thing since 2012, but Maroon 5's use of the theme just looks trend hopping.
I know this is much more staged than the Bday video...but who crashes a wedding? Like, a wedding only happens once or a couple of times in your life. You don't just go barging in there, the couple might not like Maroon 5. At least you get a birthday every year, these people their wedding might get ruined by some band they don't even like.
The song AND the video. 
I'm done.
The songs sound nothing alike