03/08/2011 08:56 BST | Updated 03/10/2011 06:12 BST

Sandra Bullock At Ryan Reynolds' Side For Premiere Of 'The Change-Up' In Los Angeles (VIDEO)

Sandra Bullock caused more tongues to wag, when she turned out to support her friend Ryan Reynolds at the premiere of his new film The Change-Up, in Los Angeles on Monday.

The pair have been dogged by rumours of a romance since spending New Year's Eve together at the start of the year. Reynolds has not been attached to anyone officially since splitting from actress wife Scarlett Johannson earlier in the year. Their divorce was finalised last month.

Bullock, too, has been publicly single since separating from husband Jesse James last year, soon after a string of his affairs were made public, only weeks after she carried off the Best Actress Oscar for her role in The Blind Side.

Bullock and Reynolds have been friends since co-starring in 2009's The Proposal.