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Paris Hilton and her boyfriend River Viiperi tweeted this shot after he strutted down the runway for Custo Barcelona at Barcelona Fashion Week, and now the lovebirds are en route to Madrid.

The heiress tweeted, "Love being with my love @RiverViiperi in his hometown. Such a beautiful city, the architecture is magnificent! #Madrid."

But P and her man won't be there for toooo long -- she'll be hosting a party in Belgium on Friday! "Can't wait for my party this Friday February 1st at @GothaClubBE #Brussels Going to be fun! See you there," she tweeted.

Where to next?!