She’s never gonna let him go.

Keira Knightley, 27, and her fiance, Klaxons keyboard player James Righton, 28, got their PDA on while out and about in London on Sunday, May 27.

Between smooches, the recently engaged actress also showed off her brand new bling: a round-cut diamond on a thin gold band.

Watch the lovebirds below, and try to rein in your jealousy. (It’s hard, we know.)

Credit: E! Online (via 5min) Photo: See Keira Knightley's Engagement Ring (VIDEO)

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