United Kingdom, Sept. 7 -- Denise Richards knows she can "count on" Charlie Sheen when she needs him.

The World Is Not Enough actress is "so proud" of her ex-husband - who she was married to for four years until 2006 - despite all the ups and downs in their relationship, and admitted it was an "honour" to be asked to speak in his new two-part Netflix documentary aka Charlie Sheen.

Sharing photos of herself and Charlie at the premiere of the documentary this week, Denise wrote on Instagram: "We both looked at each other on the red carpet and just laughed. Charlie asked, "Is it 2002?" and I said, "It sure feels like it." Who would have thought?

"What a journey we've had- so many ups and downs. But when life gets tough, deep down we both ...