One Direction stars Niall Horan and Liam Payne are planning a joint 21st.
Horan revealed that they will be celebrating the landmark birthday together since their birthdays are close together, with Payne's on August 29 and Horan's on September 13.
The Mullingar-born singer also said that he's excited to be able to have an alcoholic drink in the US where the band will be performing as part of their Where We Are Tour.
Horan told Spin 103.8: "I reckon myself and Liam are probably going to end up having a joint 21st because his birthday is about two weeks before mine.
"We'll have a few drinks there. We've been touring America for the past three years and not been able to touch a drop."
The star also spoke about his excitement at returning home for their Croke Park gig in Dublin on May 23.
He said: "Croker is going to be unbelievable, we're all saying it. It's been a while since we've been in Dublin last, I haven't been at home since Christmas."