Zac Efron appeared ''very much in love'' with Sami Miró as they celebrated his birthday in Amsterdam at the weekend.

The 'That Awkward Moment' star turned 27 on Friday (18.10.14) and to celebrate he and his rumoured new girlfriend took a trip to Amsterdam, where onlookers described them as hugging and laughing a lot together.

One source told E! News: ''They were acting very much in love, she kept hugging him. Their love looked genuine.'' And as well as spending time with Sami, Zac also hung out with friends Dillon Francis and Martin Garrix, enjoying a bike ride before attending the Amsterdam Dance Event Festival together.

Though Zac and Sami haven't confirmed their relationship, they were recently spotted shopping in Denmark and also tucked into a ''sophisticated'' meal. The actor recently wrote on his WhoSay page: ''Thx to @ReneRedzepiNoma and team @Nomacph.

You've created a sophisticated, one of a kind culinary experience I'll never forget. You rock! (sic)'' And the couple were also seen dining at Los Angeles' FoodLab, where the 'High School Musical' actor was overheard introducing Sami as his ''girlfriend''. They have also taken in a Los Angeles Dodgers baseball game together and recently went on a double date with Dylan Penn and her male companion.