Nina Agdal and Jack Brinkley-Cook Pack on PDA in Mexico

Nina Agdal and Jack Brinkley-Cook are loved up in Mexico.

The model and Christie Brinkley's son couldn't keep their hands off each other while on the beach Thursday in Tulum. The two never seemed to let go of each other while kissing and frolicking through the ocean.

Wearing a mismatched white bikini top with olive bottoms, Agdal couldn't keep the smile off her face as she enjoyed the day with her boyfriend.

The couple has been together since summer and by the looks of it, things are going really, really well.

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