George and Amal Clooney celebrated their first wedding anniversary with a ''quiet romantic meal''.

The 54-year-old actor tied the knot with the British lawyer in a star-studded ceremony in Venice, Italy, last September but marked a year of marriage in a more low-key way at the Sunset Tower Hotel's Tower Bar in West Hollywood on Sunday (27.09.15).

An onlooker told Us Weekly magazine: ''It was a lovely, quiet romantic meal, just the two of them.''

Another source said: ''They stayed a few hours. They celebrated with champagne and both of them were all dressed up for the occasion. She had on a fancy dress and gorgeous jewellery.''

The couple arrived at the restaurant at 10pm and it is likely they celebrated so late in the evening as George had previously revealed he was committed to paying tribute to 'Ocean's Eleven' producer Jerry Weintraub, who died in July, earlier in the day.

He said recently: ''Unfortunately, I have to speak at Jerry Weintraub's memorial. This is his last producorial way of screwing me over, that on my anniversary, I have to go to his memorial.''

Meanwhile, the proud husband admitted he does worry about human rights lawyer Amal, who is currently representing ousted Maldives president Mohamed Nasheed.

He added: ''She's a grown woman with her own career.

''It's tough when they're stabbing her co-counsellor [defence lawyer Mahfooz Saeed] in the head a couple days before she gets there. It's a little nerve wracking. But she's doing the right thing and she's doing it for the right reasons.''

The 'Monuments Men' star recently joked his role is to be ''shiny and pretty'' in his marriage to Amal.

He said: ''Shiny and pretty - that's mostly what I do now.''