VLAN taggin at VM level

Here's the scenario:

ESXi 5.1 on a private network; 10.1.xx.xx

Connected to trunk port on switch on same private network

Only have 1 NIC which is a gig port

I need to create a CentOS VM on a public network in X VLAN and can't for the life of me figure it out.  Any help is much appreciated.