Chris Hemsworth and Elsa Pataky run into Sienna Miller and her mother in London, England on June 24, 2012. Credit:

Oh, to be Sienna Miller.

The G.I. Joe: The Rise of Cobra actress -- who will welcome her first child with Tom Sturridge, 26, in early July -- joined her mother for lunch in London June 26. After finishing their meals, the British mother-daughter duo left the restaurant and bumped into none other than Chris Hemsworth, 28, and his wife Elsa Pataky, 35, on the street.

The new parents were taking their daughter, India Rose, nearly 7 weeks, for a stroll prior to their chance encounter with Miller and her mom. Since becoming first-time parents May 11, Australia-born Hemsworth has been enjoying every moment with his little girl.

"She's been great," he told Us Weekly earlier this month. "She sleeps very well. Not out of any skill on my behalf, but my wife has been amazing."

Fatherhood has "certainly taken all my focus and attention away from work," he added, "but that's the main thing on my brain right now. It's wonderful."

Miller, 30, has said very little about her pregnancy after Us first revealed her happy news in January. "I'm feeling fine," she told British Vogue in April. "It's all progressing nicely and it's very exciting."