Can I run a command loaded from .bashrc with sudo?

I have some custom functions and aliases defined in my .bashrc file. Sometimes I need to execute whem as root. I then do something like:

$ sudo custom_cmd 80                                                                                                                                   
sudo: custom_cmd: command not found

How can I execute such commands with root privileges?

EDIT: Of course to achieve that I could simply source my .bashrc as root but I want to know if there is some quick (in terms of typing needed) way to do this. I also would like to avoid any customization if that is possible (such as sourcing my .bashrc automatically).