United Kingdom, Sept. 6 -- Will Arnett is dating Carolyn Murphy.

The 55-year-old actor has embarked on a new romance with the model after quietly splitting from Alessandra Brawn after five years together.

Sources told People magazine that Will and Alessandra "remain committed co-parents" to their five-year-old son Denny.

The Smartless podcaster stepped out with Carolyn - who has 24-year-old Dylan from a previous relationship - in London a few weeks ago to see Sean Hayes' play Good Night, Oscar.

Sean shared a photo on Instagram of himself, husband Scott Icenogle, Will and Carolyn backstage at the production and wrote: "Another recent surprise visit from one of the greats. Love you, Willie.[heart emoji] #GoodNightOscar (sic)"

The forme...