Is there dramatic irony in Act 3, Scene 2 of Macbeth?

The "dramatic irony" is found in the reversal of roles
between Macbeth and Lady Macbeth.  In the beginning of Macbeth, she
is the leader and he the follower. In act I, scene 5, she says to her tentative and
circumspect husband, "Bear welcome in your eye, your hand, your tongue.  Look like th'
innocent flower, but be the serpent under't" (ll.75-78).  In act III, scene 2, however,
it is Macbeth who leads, saying to his worried and harried wife, regarding Banquo,
"present him eminence both with eye and tongue...and make our faces vizards to our
hearts, disguising what they are" (ll. 35-39).  Lady Macbeth, who formerly had to push
and prod her husband to action, is now straining, unsuccessfully, to hold him back. 
Macbeth, who formerly lacked "the illness that should attend" ambition (I,5,ll.19-20)
and was "too full o' th' milk of human kindness" (I,5,ll.17), is now seemingly
unstoppable in his quest for uncontested power.