One Direction's Niall Horan was spotted looking cool and clam as he visited a gym in West Hollywood today after photos emerged of him and long time friend Justin Bieber with a `suspicious pipe' last night. 

Twitter went into a frenzy after pictures of the two pop stars surfaced online. A video also emerged of the pair sitting around a coffee table which had a suspicious looking pipe on it.

It is surrounded by a lighter, a bottle of water, and other items. Despite reports, there is no suggestions that the boys were involved in drug taking.

Today Niall looked relaxed, wearing his trademark Westmeath GAA jersey. 

The One Direction star and Bieber were pictured hanging out with Australian singer Cody Simpson with Bieber tweeting about their "good times" to which Simpson replied: "jamming!"

Soon after the pictures of Bieber and Horan appeared on Twitter last night, #NiallHoranOnShots began trending worldwide.

However, Horan later distanced himself from the photos and tweeted:

The clip, which was reportedly taken from Simpson's Snapchat account, shows Bieber singing Home To Mama.

Meanwhile, Horan fans are keeping the Twittersphere alive today as it's #NiallAppreciationDay. Yes it's a thing! Here's just a brief selection of some of the tweets: