The Tinker Tailor Soldier Spy star has been on a string of dates with the blonde beauty, who has modelled for Chanel and Versace, and they most recently attended supermodel Natalia Vodianova's charity launch together in London on Wednesday (29Aug12).
Cumberbatch was said to have been inseparable from 26-year-old Elizarova at the event, but he has laughed off reports they are in a serious relationship.
He tells Britain's Sunday Telegraph, "We're just old friends. I can't say any more than that."
And he suggests she's helping him brush up on his language skills: "Russian is a wonderful language. I'd love to be able to master it."
Cumberbatch split from his girlfriend of 10 years, Olivia Poulet, last year (11) and subsequently dated fashion designer Anna Jones.
The War Horse star ended a 10-year relationship with his longterm partner, actress Olivia Poulet, last March (11) and his subsequent romance with fashion designer Anna Jones came to an end in January (12).
Cumberbatch has now reportedly moved on with model/actress Lydia Hearst, 27, who split from actor Jeff Goldblum last year (11).
The pair has been spotted on several dates, and they went to Sir Elton John's annual Academy Awards viewing party together on Sunday night (26Feb12), according to Britain's Daily Mail.
Hearst's publishing heiress mother Patty was famously kidnapped by a left-wing guerilla group in 1974 and she went on to rob a bank with them in California. She was later arrested and sentenced to 35 years behind bars, but only served two after her jail time was cut by former U.S. President Jimmy Carter.
The War Horse star ended a 10-year relationship with his longterm partner, actress Olivia Poulet, last March (11) and he later moved on with Anna Jones.
However, Cumberbatch's sister Tracy Peacock has revealed he's ended his latest romance, and she insists her brother is just unlucky in love.
She tells Britain's The Sun, "You would have to be a pretty smart cookie to keep up with him. I think that is possibly why he has trouble with girlfriends... One of his regrets is that he hasn't found someone to settle down with. I think they would have to be someone not in the acting profession. Someone who was happy to hold down the fort (sic) while he went off and pursued his career."
The Sherlock star broke up with his longtime partner, actress Olivia Poulet, earlier this year (11), and now he has found love again with designer Anna Jones.
The pair debuted its romance by posing on the red carpet at a Vanity Fair party during the 68th Venice Film Festival, where the actor was promoting his new film Tinker Tailor Soldier Spy.
A source tells Britain's Daily Mail, "It's a very new relationship but it seems to be serious. Anna really enjoys Benedict's company and they had a lovely time in Venice. Benedict has invited her to the London premiere of his new film.
"While he's quite private about his relationships, he is very happy with Anna. They are looking forward to spending more time together."
The Sherlock star, who is currently wowing London audiences in Danny Boyle's Frankenstein stage show, is single again after breaking up with his longtime lover, actress Olivia Poulet.
The pair met while studying at Manchester University, England and went on to live together in Hampstead, North London.
A publicist for the former couple says, "It was an amicable split."