Word on the street: One Direction vs. Def Leppard

This piece of news is shaking the online sphere and the world of rock music! Rock legends Def Leppard are looking into taking legal action as a result of new song Midnight Memories from worldwide popstars One Direction sounding very similar to iconic song Pour Some Sugar On Me!

According to a source given to the Mirror online: 

"Music lawyers will routinely scour hits like this one to see if there is any evidence that a band has copied or cleverly mimicked a Def Leppard song. These cases can often take weeks to sort out because we are not talking about peanuts here - the 1D album is selling millions and if the title track goes out as a single it will generate even more money." 

I usually like to read more into things before completely trusting different sources and jumping to conclusions but I must admit that these two songs sound incredibly similar...

Midnight Memories - One Direction

Pour Some Sugar On Me - Def Leppard

What are your thoughts? Are One Direction ripping off Def Leppard?