Related Clues:

• 'Oh wow!'
• Individual
• 'Holy Toledo!'
• 'I don't believe it!'
• 'Outta sight!'
• 'That's so pretty!'
• Just ducky
• Swell
• Squeal of delight
• 'Peachy'
• See 21-Across
• 'Good one!'
• Expression of excitement
• La-la preceder
• 'What a view!'