Dianna Agron has rekindled her romance with Sebastian Stan.

The 'Glee' actress and the 'Gossip Girl' actor - who split in December after five months of dating - have decided to give their relationship another go and were seen sharing a romantic dinner on Valentine's Day (14.02.12) at Hollywood's La Poubelle Bistro.

A source told Us Weekly magazine: "They are back together. It happened over Golden Globes weekend."

The couple split because they struggled to cope with a long-distance relationship as Dianna lives in Los Angeles and Sebastian is based in New York.

Sources also claimed Dianna had trust issues and was always worried he would cheat on her.

One pal said: "She was always worried that he was cheating on her while he was away filming, but he never would!"

Before the split, Dianna - who used to date British hunk Alex Pettyfer - said she had never been happier.

The 25-year-old beauty said: "I'm the happiest that I've ever been. Ever. High school, middle school - I've loved every part of getting older and growing, but I definitely think that this is the most I've ever felt like myself and that I'm being treated like who I feel I am."