United Kingdom, Dec. 22 -- Lily Allen has been "shopping like an insane person" following the success of her album West End Girl.

The 40-year-old singer explained that she is in therapy for her spending addiction after splashing the cash on lavish items since the release of her critically acclaimed record - which addressed the end of her marriage to Stranger Things actor David Harbour - in October.

Speaking to her best friend Miquita Oliver on a Christmas special of their Miss Me? podcast, Lily said: "I'm just playing with my huge diamond and emerald ring, I bought myself a little present but it's not that little.

"You've go to treat yourself and mark the moment. I'm convinced I'm a billionaire. Handbags have been bought, jewels and a ...