Cleavage Alert: Miley Sewsll With Pride While Out With Liam

CLEAVAGE ALERT: MILEY SWELLS WITH PRIDE WHILE OUT WITH LIAM

Miley Cyrus brought out the big guns at CNN's Heroes event on Sunday night. No, not those guns: her strapping boyfriend, Liam Hemsworth. The back-on pair shared several loving looks on the red carpet, and the "Hunger Games" actor showed admirable restraint in not openly ogling the cavernous cleavage of the popster's buttery

Cavalli gown. But Miley's mammary moxie did have people talking. Click on for more .

Liam, 21, feeling an ogle coming on, closes his eyes and fights the peeping urge

Gentleman that he is, "Dancing With the Stars" champ J.R. Martinez also kept his eyes forward.

"What?" asked Miley, 19, looking down. "It's just the right amount of decolletage. Right?"

"Right?"

Miley catches a glimpse of how much skin she's actually showing, going through the five stages of red-carpet grief: denial ; anger; bargaining depression ; and acceptance

Miley opted for a less open-air gown when she took the stage at the CNN event to belt out "The Climb."

On Friday night, Miley slipped into a sparkly Jenny Packham gown and a circulation-stopping ponytail at the American Giving Awards.

This time, her couture plunge wasn't quite so steep.