Charlize Theron & Sean Penn Spark Engagement Rumors

Two of Hollywood's biggest power players might be headed down the aisle. At least that's what a sparkler on Charlize Theron's left ring finger seems to suggest.

The New York Daily News reports that the Oscar-winning actress flashed some fancy bling after landing at LAX on Wednesday. Now, tongues are wagging that the ornate bauble is an engagement ring from Theron's beau, Sean Penn.

Theron told Vogue earlier this year that she "never had the dream of the white dress," but she and Penn have still been the subject of engagement rumors for quite some time. Just last week, OK! reported that the two planned to marry and also adopt a child. Theron adopted son, Jackson, in 2012, while Penn has two grown children — including model Dylan Penn — with ex-wife Robin Wright.

This would be the third marriage for Penn, who is currently directing Theron in The Last Face in her native South Africa. He was also married to Madonna. Theron dated actor Stuart Townsend for nearly nine years before splitting in 2010.

Bottom line: Keep an eye on that left ring finger, folks. Sealize is getting serious. (People)