It’s possible, but you can’t use the default Kerberos authentication in that scenario. Off the top of my head, I don’t remember if the PSRemoting commands automatically fall through to NTLM authentication if Kerberos isn’t avaialble, or if you have to specify it yourself by using the “-Authentication Negotiate” argument when calling New-PSSession, Invoke-Command, etc.
You’ll also either have to set up an HTTPS listener, or use the TrustedHosts list (HTTPS being the more secure option, since it authenticates the remote computer before it exposes anything related to your user credentials.) There are examples of how to do both of these in the free “Secrets of PowerShell Remoting” ebook, which you can download from http://powershell.org/wp/ebooks/ .