Both actresses opted for smart and chic LBDs and dared to bare in low-cut styles. Adams, who is nominated for a Supporting Actress award at the BAFTAs for her role in The Fighter, flaunted her curves in a particularly plunging number, fastened together with a studded butterfly-shaped broach.
However, she wasn't the only one showing off her figure. Mirren looked as lovely as always in a sequin-bodice dress teamed with peep-toe pumps and a satin clutch.
Watch this space to see if the actresses continue to impress at the BAFTAs next month.
How do you rate their red carpet style? Leave a comment below.