Bikini clad Selena Gomez

There's something about Mexico that brings heat to any relationship, and Justin Bieber and Selena Gomez's romance is no exception.

The teenage couple looked completely loved up as they lounged poolside in sunny Los Cabos today.

The 19-year-old Disney starlet had clearly just come from a dip in the water as she leaned into her boyfriend in an attempt to rouse him from his slumber.

The 17-year-old Baby singer seemed content to stay on dry land as he soaked up the sultry Mexican sunshine.

He had an arm casually slung around his girlfriend's dripping wet hair as she whispered sweet nothings into his ear.

Although she looked fabulous in her pink bikini, her tiny two-piece didn't do the trick in waking her man up - she was later seen typing away on her phone as he continued to sleep.

However, later on today, the holiday was all over for the stars as they arrived back on home soil.

They clutched hands as they arrived in Washington D.C., although Selena looked particularly shy and held her hand over her face the entire time.

The loved up pair were in the nation's capital to perform at the Christmas In Washington concert this Sunday.