Brian O'Driscoll takes a swing at Carlow man Sean O'Brien

Brian O'Driscoll might be busy down under, with a baby daughter and the final Lions test this weekend - but not too busy to have a go at team mate Sean O'Brien.

Brian O'Driscoll might be busy down under, with a baby daughter to take care of and the final Lions test this weekend - but not too busy to have a go at team mate Sean O'Brien.

The Carlow man, nicknamed "The Tullow Tank" got a bit of stick from Dubliner O'Driscoll for his farming background back home.

This guy is a beaut! pic.twitter.com/JYvTK28RMQ

— Brian O'Driscoll (@BrianODriscoll) July 1, 2013

#tullowtank pic.twitter.com/obZ2uoWlB8

— Brian O'Driscoll (@BrianODriscoll) July 1, 2013

Then things got personal.

"Hard to keep the weight off @SeanOBrien1987 when you're injured huh?! #levisassmodel" tweeted O'Driscoll.

But Seanie wasn't going to take the hassle from Dublin's finest lying down, and went on the offensive with some of BOD's, eh, "interesting" fashion choices down through the years:

Shape of his life... pic.twitter.com/i0Czv7MbTt

— Sean O'Brien (@SeanOBrien1987) July 1, 2013

Still, we're sure they're the best of friends in real life. And if not, there's always "tackling practice" at the training ground.