Minka Kelly dismisses Sean Penn romance rumours

Actress Minka Kelly has dismissed reports she is dating Sean Penn after the couple was spotted celebrating her birthday together last month.

Penn. 54, and Kelly, 35, were photographed having dinner at exclusive restaurant French Laundry in Napa Valley, California.

The usually private Kelly took to Twitter to brush off the speculation, and wrote, "Not my nature to address gossip but hoping this last one goes away already. Not dating a friend I had a group dinner with. #Sillymedia."

The reported relationship comes a month after Penn's split from Hollywood beauty Charlize Theron in May. Kelly has previously dated "Captain America star" Chris Evans and baseball hero Derek Jeter.