Both of them hit the town after watching the Ultimate Fighting Championship at the O2 Arena recently, reported Contactmusic.
The pair then moved on to enjoy some drinks at celebrity haunt Shoreditch House in East London.
"The boys were in high spirits and joking and laughing together about which one was the biggest lightweight", said a source.
Noticeably absent from the boy's night out were the rest of Horan's One Direction bandmates, who are currently enjoying some time off following their 'Take Me Home' world tour last year.
"Niall and Brian must have racked up a hefty bill as they weren't holding back with ordering the drinks", the source added.
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