Pat was joined by Kealan Lennon, founder and CEO of the Irish start-up "Cleverbug" which is currently number one in the iTunes app store for greeting cards, after less than a year in business.

'Cleverbug' is an app that allows you to send printed birthday cards to your family and friends, personalised with photos retrieved from Facebook.

The Dublin-based company has already secured a network of 25 million people in 150 countries worldwide, 40% of whom are resident in the United States, prompting 'Cleverbug' to open an second office in San Francisco to meet demand.

Listen back to Kealan's interview with Pat on this morning's show here:

Kealan also surprised Pat with some personalised cards of his own when he joined him in-studio:

For more information on 'Cleverbug' click here: http://bit.ly/CleverNT