"The Bachelorette" star Ali Fedotowsky and her new fiance Roberto Martinez took their PDA Tour to the streets of L.A. yesterday.

The couple walked hand-in-hand through the swarm of paparazzi -- and even stopped to show off the engagement ring to a group of cheering fans on a tour van.

When we asked Ali if this was the happiest she's ever been, she quickly responded "yes, I am."

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