I dunno, someone like *coughsRyanReynolds*. No, really, it's Ryan Reynolds. It's Deadpool without the mask. There ya go! So, in short, it's Ryan Reynolds, doing Deadpool, doing Hugh Jackman.
Now that we're up to speed, Hugh Jackman posted the below to his Instagram a matter of hours ago, captioned: "Presenting ... ME by HIM. @vancityreynolds #SMA" And the results are mesmerising. Nailing a top notch Aussie accents, Reynolds burbles "G'day, Mate! Hugh Jackman here. Just reminding you to get your votes in for People's Sexiest Man Alive. Cover's coming up." 
 


Hugh Jackman and Ryan Reynolds co-starred in X-Men: Origins - Wolverine. And this here snippet may suggest a Jackman cameo in Deadpool. Just saying.