Britney Spears went partying wearing a completely see-through black lace mini-dress on Friday night. The 'Toxic' singer - who recently apologised to fans after being pictured without underwear and thanked God for the new Victoria's Secret underwear line - was displaying her black knickers and red bra for all to see. A source told gossip website X17Online: "At least she remembered her panties this time, but I don't know why she bothered wearing the dress at all. You could see everything! Her figure is looking great though."The mother-of-two, who gave birth to second son Jayden James in September,enjoyed dinner at Beverly Hills restaurant Dominick's in her revealing outfit. Britney, 25, then headed to her new favourite hang out - burlesque club Forty Deuce - where she allegedly jumped on stage and gave a raunchy performance of her own.The newly single star then finished the night at Teddy's nightclub before returning home in the early hours of the morning. The 'Oops. I Did It Again' singer filed for divorce from husband KevinFederline last month and both are seeking full custody of their sons 15-month-old Sean Preston and three-month-old Jayden James.